CN106945209B - Liquid removing equipment and liquid removing method - Google Patents
Liquid removing equipment and liquid removing method Download PDFInfo
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- CN106945209B CN106945209B CN201710308969.9A CN201710308969A CN106945209B CN 106945209 B CN106945209 B CN 106945209B CN 201710308969 A CN201710308969 A CN 201710308969A CN 106945209 B CN106945209 B CN 106945209B
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- liquid
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- absorbing
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/0092—Drying moulded articles or half products, e.g. preforms, during or after moulding or cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
Landscapes
- Cleaning In General (AREA)
- Surface Treatment Of Optical Elements (AREA)
Abstract
A liquid removing device and a liquid removing method. The liquid removing device comprises a liquid absorbing roller which is used for contacting an optical film and absorbing liquid on the surface of the optical film. The liquid suction roller comprises a core body and a water suction structure. The core body has a solid portion and a hollow portion, the solid portion has a plurality of through holes, and the water absorbing member covers the core body and covers the through holes.
Description
Technical Field
The present invention relates to a liquid removing apparatus and a liquid removing method, and more particularly, to a liquid removing apparatus and a liquid removing method for an optical film.
Background
In the preparation process of the optical film material, the optical film material is usually required to be soaked in various process baths for carrying out a dyeing crosslinking preparation process, a surface treatment preparation process or a water washing process, and then is rolled after being dried. However, before the optical film is dried, the residual liquid on the surface of the optical film cannot be removed effectively, and the residual liquid is prone to generate water stain and/or dirt after being dried, thereby affecting the optical properties of the optical film.
Disclosure of Invention
The invention aims to provide liquid removing equipment and a liquid removing method, which aim to overcome the defect that liquid remains on the surface of an optical film material before the optical film material is dried in the prior art.
To achieve the above object, the present invention provides a liquid removing apparatus comprising:
a liquid suction roller for contacting and sucking a liquid on a first surface of an optical film material to remove the liquid remaining on the surface of the optical film material, the liquid suction roller comprising:
a core body, which is provided with a solid part and a hollow part; and
a water absorbing material, which covers the core.
Furthermore, the solid part is provided with a plurality of through holes, and the water absorbing component covers the through holes; and/or the solid part is formed by metal, hard plastic or rubber; and/or the water-absorbing material is made of sponge, non-woven fabric, fabric or polyester fiber.
Further, the diameter of the liquid suction roller is 100-200 mm; and/or the liquid absorbing roller further comprises a pipeline and a vacuum pump, one end of the pipeline is connected with the vacuum pump, and the other end of the pipeline is connected with the inner edge of the solid part, wherein the vacuum pump is used for pumping the hollow part to enable the pressure of the hollow part to be smaller than the pressure outside the liquid absorbing roller; and/or the liquid suction roller also comprises a vacuum pump, and the vacuum degree of the vacuum pump is between 47kPa and 87 kPa.
Further, at least 1/4 of the circumference of the liquid suction roller contacts the optical film material; and/or when the liquid suction roller contacts with the optical film material, the tension of the optical film material is between 150N and 250N; and/or the transmission speed of the optical film material is 25-60 m/min.
Further, this remove liquid equipment still includes a pneumatic cylinder, and this fluid suction running roller is connected to this pneumatic cylinder for the position of controlling this fluid suction running roller is with the area of contact of adjusting this fluid suction running roller and this optical film material.
Furthermore, the liquid removing equipment also comprises a pair of clamping rollers, wherein the pair of clamping rollers are used for extruding the first surface of the optical film material and a second surface opposite to the first surface to remove the liquid; and/or
The first air knife is used for blowing gas to the first surface of the optical film material and/or a second surface opposite to the first surface so as to remove liquid; and/or
The second air knife and the roller are respectively arranged at two opposite sides of the optical film, and the second air knife is used for blowing gas to the first surface of the optical film positioned on the roller so as to remove liquid.
In order to achieve the above object, the present invention further provides a liquid removing method, comprising:
(a) conveying an optical film material through a process bath;
(b) sucking the liquid on the surface of the optical film material by the liquid removing equipment; and
(c) the optical film is dried.
Further, the method of removing liquid further comprises providing a surface treatment to the first surface, and after step (c), the first surface has a water contact angle of between 70 ° and 100 °; and/or the amount of the liquid adhering to the first surface is 0.01 to 0.15g/m2。
Furthermore, the first surface of the optical film material is an uneven surface with a concave-convex shape; and/or the first surface comprises a plurality of light-transmitting particles.
Further, the area ratio of the plurality of light-transmissive particles occupying the first surface is 30 to 94%; and/or the average particle diameter of the plurality of light-transmitting fine particles is 0.5 to 15.0 μm; and/or the refractive index of the plurality of light-transmissive fine particles is 1.45 to 1.68; and/or the material of the plurality of light-transmitting fine particles is selected from silica inorganic particles, or organic particles selected from silicone resin, polystyrene resin, melamine resin, polyester resin, acrylic resin, olefin resin, or a copolymer thereof.
In view of the above, embodiments of the present invention provide a liquid removing apparatus and a liquid removing method, which can effectively remove the liquid remaining on the first surface of the optical film.
The invention has the beneficial effects that: the liquid absorbing roller can further reduce the attachment amount of the liquid on the first surface of the optical film material to 0.01-0.15 g/m2Thereby solving the contamination problem of the optical film material and increasing the yield of the process. In one embodiment, the tension of the optical film is maintained, so that the liquid suction roller can effectively contact with the first surface of the optical film, the liquid suction effect of the first surface of the optical film is better, the situation that the liquid suction roller rotates unsmoothly is avoided, the optical film is prevented from being scratched, and the yield of the manufacturing process is increased. One embodiment of the inventionIn the middle, the imbibition running roller is connected in pneumatic cylinder to increase the area of contact of imbibition running roller and optical film material. In one embodiment, the liquid on the first surface and the liquid on the second surface of the optical film material can be removed more effectively and simultaneously by the way of driving the edge to squeeze by the nip roller. In one embodiment, the first air knife and/or the second air knife can effectively remove the liquid remaining on the first surface and/or the second surface of the optical film, and the production yield can be improved. In one embodiment, the liquid absorbing roller adopts a negative pressure absorption principle to improve the liquid absorption efficiency, and absorbed liquid can be continuously discharged outwards through a pipeline. In addition to better water absorption efficiency compared with the prior art, the water absorption structure is not saturated, a production line is required to be interrupted for cleaning, and/or the water absorption device is required to be replaced, so that the transmission speed of the optical film material is greatly improved, the production speed is increased, and the length proportion of defective products is reduced to be less than 0.5-1% of the total production length.
In order to better appreciate the above and other aspects of the present invention, the following detailed description of the embodiments is provided in conjunction with the accompanying drawings.
Drawings
Fig. 1A is a schematic diagram of a part of a process for manufacturing an optical film according to an embodiment of the disclosure.
Fig. 1B is a schematic diagram of a portion of a process for making an optical film according to another embodiment of the present disclosure.
Fig. 2 schematically shows an exploded view of the structure configuration of the liquid suction roller according to an embodiment of the present disclosure.
Fig. 3 is a schematic cross-sectional view of a liquid suction roller for contacting an optical film and sucking liquid on the surface of the optical film according to an embodiment of the disclosure.
Wherein, the reference numbers:
1: process bath
2: optical film material
3: liquid removing equipment
4: liquid suction roller
5: drying chamber
10: conveying system
22: first surface
221: light-transmitting fine particle
24: second surface
31: a pair of nip rollers
32: first air knife
33: second air knife
34: roller wheel
40: fixed guide wheel
41: core body
41 b: solid part
41 e: hollow part
41 h: through hole
42: water-absorbing material
43: vacuum pump
44: pipeline
45: pneumatic cylinder
D1: direction of conveyance
D2: direction of rotation
W: liquid, method for producing the same and use thereof
α corner of joint
Detailed Description
The invention relates to liquid removing equipment and a liquid removing method. In an embodiment of the present invention, an apparatus for use in a process of manufacturing an optical film includes a liquid suction roller for contacting the optical film and sucking liquid on a surface of the optical film, thereby removing the liquid remaining on the surface of the optical film.
It should be noted that the present invention is not intended to show all possible embodiments, and other embodiments not suggested by the present invention may also be applicable. Moreover, the dimensional proportions shown in the drawings are not to scale with actual products. Accordingly, the description and drawings are only for the purpose of illustrating embodiments and are not to be construed as limiting the scope of the invention. In addition, the descriptions of the embodiments, such as detailed structures, manufacturing steps, material applications, etc., are provided for illustrative purposes only and are not intended to limit the scope of the present invention. The details of the steps and structures of the embodiments may be changed or modified as required by practical application of the manufacturing process without departing from the spirit and scope of the present invention. The following description refers to the same or similar components with the same or similar reference characters.
Fig. 1A is a schematic diagram of a partial preparation process of an optical film 2 according to an embodiment of the disclosure. The optical film material 2 of the present invention may be a single-layer or multi-layer optical film, such as a polarizing film or a protective film; or may be an optical laminate formed of a multilayer optical film, for example, including a polarizing film and a protective film formed thereon, or the optical film 2 may also include layers that contribute to optical gain, alignment, compensation, turning, orthogonality, diffusion, protection, anti-sticking, scratch resistance, anti-glare, reflection suppression, high refractive index, and the like. In the present embodiment, the optical film 2 is a continuous roll material.
The material of the polarizing film may be a polyvinyl alcohol (PVA) resin film, which may be prepared by saponifying a polyvinyl acetate resin. Examples of the polyvinyl acetate resin include a homopolymer of vinyl acetate, i.e., polyvinyl acetate, and a copolymer of vinyl acetate and other monomers copolymerizable with vinyl acetate. Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids (e.g., acrylic acid, methacrylic acid, ethyl acrylate, n-propyl 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., vinylsulfonic acid, sodium vinylsulfonate), and the like.
The material of the protective film may be selected from a group consisting of Polymethylmethacrylate (PMMA), Triacetylcellulose (TAC), acryl resin film, polyaromatic hydroxyl (Poly-Aromatic Hydrocarbons) resin film, polyether resin film, cyclic polyolefin resin film (e.g., polynorbornene resin film), Polyester (PET), Polypropylene (PP), Cyclic Olefin Polymer (COP), Polycarbonate (PC), and any combination thereof.
In one embodiment, the apparatus for a portion of the manufacturing process of the optical film 2 may include a transport system 10, a process bath 1, a liquid removal apparatus 3, and a drying chamber 5. The conveying system 10 includes at least one roller for carrying and conveying the optical film 2. In the embodiment shown in fig. 1A, the optical film 2 passes through the process bath 1, the liquid removing apparatus 3 and the drying chamber 5 in sequence along the conveying direction D1 by the conveying system 10. In one embodiment, the optical film 2 may be guided by the conveying system 10 through at least one process bath 1 to perform a dyeing crosslinking preparation process, a surface treatment preparation process or a water washing process. In one embodiment, the transmission speed of the optical film 2 is 25-60 m/min, preferably 35-50 m/min.
In one embodiment, the optical film material 2 is a Polyvinyl Alcohol (PVA) film that has been dyed (e.g., with iodine or dichroic dye added thereto), the process bath 1 is, for example, a water washing process bath, and the optical film material 2 may be subjected to a water washing process therein to remove a treatment solution, such as a treatment solution of a swelling tank, a dyeing tank, and/or an extension tank, attached from a previous process bath. The liquid removing apparatus 3 is used for removing the liquid, such as a treatment liquid and/or a rinsing liquid, remaining on the surface of the optical film 2 after the treatment of the process bath 1. The drying chamber 5 is used for drying the optical film 2 after removing liquid, such as treatment liquid and/or washing liquid. In one embodiment, the drying chamber 5 is, for example, an oven, but not limited thereto.
In another embodiment, the optical film 2 may be a cellulose triacetate film having a first surface 22 and a second surface 24 opposite to the first surface 22. The first surface 22 of the cellulose triacetate film may be surface treated to form a functional layer, such as a hard coat layer, an anti-reflection layer, an anti-adhesion layer, a diffusion layer, or an anti-glare layer. In general, the cellulose triacetate films have a water contact angle of 90 ° to 110 ° for the first surface 22 of the functional layer, and a water contact angle of 40 ° to 50 ° for the second surface 24 without the functional layer.
In an embodiment, the first surface 22 with the functional layer may be an uneven surface with a concave-convex shape, or the first surface 22 with the functional layer may include a plurality of light-transmissive particles (not shown). In one embodiment, the area ratio of the light transmissive particles occupying the first surface 22 may be 30 to 94%, the average particle size of the light transmissive particles may be 0.5 to 15.0 μm (micrometer), and the refractive index of the light transmissive particles is 1.45 to 1.68. In one embodiment, the material of the light-transmissive fine particles may be selected from inorganic particles such as silica fine particles, or organic particles such as silicone resin, polystyrene resin, melamine resin, polyester resin, acrylic resin, olefin resin, or copolymers thereof, and the light-transmissive fine particles may be used alone or in combination of 2 or more.
When the cellulose triacetate film is used as a protective film of the polyvinyl alcohol film, in order to make the second surface 24 of the cellulose triacetate film adhere to the polyvinyl alcohol film more densely, the cellulose triacetate film is firstly subjected to an alkalization treatment to increase the surface hydrophilicity. However, after the cellulose triacetate film with the functional layer is alkalized, the first surface 22 with the functional layer has a changed surface structure, so that the water contact angle is still between 70 and 100 degrees, compared with the second surface 24 without the functional layer, the water contact angle is reduced to below 30 degrees. In other words, the liquid tends to remain on the first surface 22 of the cellulose triacetate film having the functional layer and cannot be removed effectively. In general, the liquid adhering amount of the alkalized cellulose triacetate film on the first surface 22 of the functional layer is 0.75g/m after the liquid removing operation is performed by a common liquid removing device2And the amount of liquid adhering to the second surface 24 having no functional layer is 0.01 to 0.15g/m2Further, after the drying process, foreign substances such as water stain and dirt are easily left on the first surface 22 of the cellulose triacetate film with the functional layer, which may cause contamination and affect the optical performance to reduce the manufacturing yield.
Therefore, the liquid removing apparatus 3 of the present invention is required to effectively remove the liquid remaining on the first surface 22 of the optical film material 2, such as the treatment liquid and/or the aqueous solution, particularly the liquid remaining on the first surface 22 having a large water contact angle.
In one embodiment, the liquid removing apparatus 3 may include a liquid suction roller 4 for contacting the optical film 2 and sucking the liquid on the first surface 22 of the optical film 2. More specifically, the liquid suction roller 4 is rotatable with the optical film material 2 being conveyed and is brought into contact with lightWhen the first surface 22 of the optical film 2 is drawn, the liquid, such as the treatment liquid and/or the aqueous solution, on the first surface 22 of the optical film 2 is absorbed, so as to remove the liquid, such as the treatment liquid and/or the water washing liquid, remaining on the first surface 22 of the optical film 2. Although the water contact angle of the first surface 22 of the optical film material 2 is between 70 DEG and 100 DEG, the liquid suction roller 4 of the invention can further reduce the liquid adhesion amount of the first surface 22 of the optical film material 2 to 0.01 to 0.15g/m2Thereby solving the problem of contamination of the optical film 2 and increasing the yield of the process.
As shown in fig. 1A, at least 1/4 of the circumference of the suction roller 4 is in direct contact with the first surface 22 of the optical film material 2, in other words, the junction angle α of the first surface 22 of the optical film material 2 on the suction roller 4 may be greater than 90 °, for example, between 90 ° and 100 °, more preferably, at least 1/3 of the circumference of the suction roller 4 is in contact with the first surface 22 of the optical film material 2, in other words, the junction angle α of the first surface 22 of the optical film material 2 on the suction roller 4 may be greater than 120 °, for example, between 120 ° and 130 °, whereby the suction roller 4 has a more preferable liquid effect of sucking up the first surface 22 of the optical film material 2.
In one embodiment, the suction roller 4 can be connected to the pneumatic cylinder 45, and the pneumatic cylinder 45 can control the position of the suction roller 4, i.e., the contact area between the suction roller 4 and the optical film 2 can be adjusted by driving the suction roller 4 to move forward or backward along the direction D2 toward the optical film 2. For example, the pneumatic cylinder 45 can drive the liquid suction roller 4 to advance toward the optical film 2 along the direction D2, thereby increasing the contact area between the liquid suction roller 4 and the optical film 2.
In one embodiment, the tension of the optical film 2 is between 150N (newton) and 250N by adjusting the positions of the fixed guide roller 40 and the liquid-absorbing roller 4 during the contact between the liquid-absorbing roller 4 and the optical film 2. By means of the above arrangement, the liquid absorbing roller 4 can effectively contact with the surface of the optical film 2, so as to effectively absorb the liquid, such as the treatment liquid and/or the aqueous solution, on the first surface 22 of the optical film 2, and prevent the liquid absorbing roller 4 from rotating unsmoothly and the optical film 2 from being scratched, thereby increasing the yield of the process. As described above, in the embodiment of the present invention, by selecting and designing the material of the liquid absorbing roller 4, adjusting the position of the liquid absorbing roller 4 by the pneumatic cylinder 45, and controlling the tension of the optical film 2, the liquid absorbing roller 4 can directly contact the optical film 2, especially the optical film 2 having the functional layer, and efficiently absorb the liquid on the first surface 22 of the optical film 2 having the functional layer without damaging the optical film 2.
In one embodiment, the liquid removing apparatus 3 may further optionally include a pair of nip rollers (nip rollers) 31 for pressing the first surface 22 and the second surface 24 of the optical film 2 to remove liquid, such as the processing liquid and/or the aqueous solution, on the surface of the optical film 2. In one embodiment, the nip roller 31 may advance the transfer optical film 2 in a reverse S-shape (as shown in fig. 1A), and simultaneously press the first surface 22 and the second surface 24 of the optical film 2 to remove the liquid. Compared with the conventional roller for linearly conveying and extruding the optical film, the manner of pressing the optical film while driving the nip roller 31 can effectively remove the liquid, such as the treatment liquid and/or the aqueous solution, on the first surface 22 and the second surface 24 of the optical film 2 at the same time.
In one embodiment, the liquid removing apparatus 3 may further optionally include at least one first air knife (air knife)32 for blowing air onto the first surface 22 and/or the second surface 24 of the optical film 2 to remove liquid, such as the treatment liquid and/or the aqueous solution, from the surface of the optical film 2.
In another embodiment, as shown in fig. 1B, the liquid removing device 3 may further include a second air knife 33, and the second air knife 33 and the roller 34 may be respectively disposed on two opposite sides of the optical film 2. For example, the gas blowing port of the second air knife 33 may face the first surface 22 of the optical film 2, and the optical film 2 may contact the roller 34 with the second surface 24. The second air knife 33 is used for blowing gas to the first surface 22 of the optical film 2 on the roller 34 for removing liquid. In one embodiment, the roller 34 can be a deflector roller. In one embodiment, the second air knife 33 may blow a greater intensity of gas than the first air knife 32. In an embodiment, since the second air knife 33 is disposed at one side of the roller 34, the optical film 2 can maintain flatness by the support of the roller 34, and the optical film 2 is prevented from being deformed due to too large air flow blown by the second air knife 33. Although the first air knife 32 and the second air knife 33 are illustrated in this embodiment, the present invention is not limited thereto, and one of the first air knife 32 and the second air knife 33 may be selected according to the actual requirement.
In one embodiment, the nip roller 31 is disposed between the process bath 1 and the liquid-absorbing roller 4, and the first air knife 32 is disposed between the nip roller 31 and the liquid-absorbing roller 4; in yet another embodiment, the second air knife 33 is disposed between the suction roller 4 and the drying chamber 5; however, the present invention is not limited thereto, and those skilled in the art can configure the number, the arrangement order or the arrangement positions of the liquid absorbing roller 4, the nip roller 31, the first air knife 32 and the second air knife 33 according to the actual requirement.
According to the present disclosure, by disposing the suction roller 4 and selectively disposing the nip roller 31, the first air knife 32 and the second air knife 33, the liquid, such as the processing liquid and/or the rinsing liquid, remained on the first surface 22 and/or the second surface 24 of the optical film 2 can be effectively removed, and the production yield can be improved.
Referring to fig. 2, an exploded view of the structure configuration of the liquid suction roller 4 according to an embodiment of the present disclosure is schematically shown. The suction roller 4 may include a core 41 and a water absorbent member 42. The diameter of the liquid suction roller 4 can be 100-200 mm (mm), and in a preferred embodiment, the diameter of the liquid suction roller 4 can be 150 mm. The core 41 may have a solid portion 41b and a hollow portion 41 e. In an embodiment, the solid portion 41b may have a plurality of through holes 41h, and the through holes 41h are distributed in the solid portion 41b and penetrate through the inner and outer surfaces of the solid portion 41 b. The solid portion 41b may be formed of a material such as metal, rigid plastic, or rubber. The water absorbing member 42 covers the core 41 and further covers the through holes 41 h. The water-absorbing member 42 is made of water-absorbing material, such as porous material like sponge, non-woven fabric, and fabric, or polyester fiber, but not limited thereto. If the material of the water-absorbing member 42 is a sponge, it can be a polyurethane sponge, a rubber sponge, a polyolefin sponge or the like, but not limited thereto.
In one embodiment, the suction roller 4 further comprises a vacuum pump 43 and a conduit 44. One end of the pipe 44 is connected to the vacuum pump 43, and the other end of the pipe 44 is connected to the inner edge of the solid portion 41 b. That is, the pipe 44 communicates with the hollow portion 41 e. In FIG. 2, only one end of the core 41 is shown connected to the vacuum pump 43, but the other end of the core 41 can also be connected to the vacuum pump 43. In the embodiment, the vacuum pump 43 is used to pump the hollow portion 41e to make the pressure of the hollow portion 41e smaller than the pressure outside the liquid absorbing roller 4, that is, to make the inside of the liquid absorbing roller 4 form a negative pressure, thereby increasing the efficiency of the liquid absorbing roller 4 absorbing the liquid on the first surface 22 of the optical film 2. In one embodiment, the vacuum level that the vacuum pump 43 can achieve is, but not limited to, 47kPa to 87kPa (350 mmHg to 650mmHg), for example.
Fig. 3 is a schematic cross-sectional view of a liquid-absorbing roller 4 for contacting the optical film 2 and absorbing the liquid on the surface of the optical film 2 according to an embodiment of the present disclosure. Referring to fig. 2 and 3, the liquid absorbing roller 4 directly contacts the first surface 22 of the optical film 2 with the water absorbing member 42. In one embodiment, the liquid suction roller 4 can directly suck the liquid W, such as the processing liquid and/or the rinsing liquid, to the first surface 22 of the optical film material 2 through the water absorption member 42. Meanwhile, the vacuum pump 43 can pump the hollow portion 41e so that the pressure of the hollow portion 41e becomes negative with respect to the outside, that is, the pressure of the hollow portion 41e becomes lower than the pressure outside the liquid suction roller 4. Therefore, the liquid W sucked into the water-absorbent member 42, for example, a treatment liquid and/or a rinsing liquid, is continuously sucked into the hollow portion 41e through the plurality of through holes 41h, and is discharged out of the hollow portion 41e through the pipe 44. Since the liquid W is, for example, a processing liquid and/or a rinsing liquid, the hollow portion 41e is continuously evacuated by the vacuum pump 43 and is continuously discharged through the pipe 44. Therefore, the liquid absorbing roller 4 of the present invention has better water absorbing efficiency than the prior art, and the water absorbing member 42 is not saturated and needs to be interrupted for cleaning and/or the water absorbing device needs to be replaced, so that the transmission speed of the optical film 2 can be greatly increased, the production speed can be increased, and the length proportion of the defective products can be reduced to be less than 0.5-1% of the total production length.
For example, when the liquid absorbing roller 4 of the present invention is not installed, the optical film 2 with a length of 1000 m is produced, the transmission speed of the optical film 2 is less than 25 m/min, and the length of the defective product of the optical film 2, such as the first surface 22, where too much liquid still remains, is 20-25 m. However, by providing the liquid absorbing roller 4 of the embodiment of the present invention, the transmission speed of the optical film 2 can be increased to 25-60 m/min, and the length of the defective product of the optical film 2 can be reduced to 5-10 m, thereby reducing the defective rate.
In addition, by adjusting the contact area between the liquid absorbing roller 4 and the optical film material 2, for example, by moving the liquid absorbing roller 4 through the pneumatic cylinder 45 to increase the contact area between the liquid absorbing roller 4 and the optical film material 2, the speed of the liquid absorbing roller 4 absorbing the residual liquid on the surface of the optical film material 2 can be increased, so that the transmission rate of the optical film material 2 can be further increased and the productivity can be increased under the condition of effectively removing the liquid on the surface of the optical film material 2. Furthermore, the installation of other liquid removing devices, such as the nip roller 31, the first air knife 32 or the second air knife 33, can be reduced, and the production cost can be reduced.
As shown in fig. 3, in an embodiment, the first surface 22 of the optical film 2 is, for example, a triacetyl cellulose film after being surface-treated with Anti-Glare (AG). The first surface 22 with the functional layer may be an uneven surface with concave-convex shape, or the first surface 22 with the functional layer may contain a plurality of light-transmissive particles 221. In one embodiment, the area ratio of the light transmissive particles 221 occupying the first surface 22 may be 30 to 94%, the average particle size of the light transmissive particles 221 may be 0.5 to 15.0 μm (micrometer), and the refractive index of the light transmissive particles 221 is 1.45 to 1.68. In one embodiment, the material of the light-transmissive fine particles 221 may be selected from inorganic particles such as silica fine particles, or organic particles such as silicone resin, polystyrene resin, melamine resin, polyester resin, acrylic resin, olefin resin, or copolymers thereof, and the light-transmissive fine particles may be used alone or in combination of 2 or more.
Please refer to fig. 1 to 3. According to the present disclosure, a method for removing liquid from an optical film 2 is also provided. The liquid removing method is, for example, a treatment performed after the optical film material 2 is treated in the process bath 1 and before the optical film material is dried in the drying chamber 5. First, step (a) of transporting the optical film 2 through the process bath 1 is performed. Next, the step (b) of contacting the optical film material 2 by the liquid suction roller 4 and sucking the liquid on the surface of the optical film material 2 is performed. The detailed structure of the liquid suction roller 4 is as described in the embodiments of the present invention, and will not be described herein. Next, the step (c) of drying the optical film material 2 passed through the liquid suction roller 4 is performed, for example, by drying the optical film material 2 in the drying chamber 5. In one embodiment, the transmission speed of the optical film 2 is 25-60 m/min, preferably 35-50 m/min.
In an embodiment, the step (b) further includes: the step of evacuating the hollow portion 41e by the vacuum pump 43 makes the pressure of the hollow portion 41e lower than the pressure outside the liquid absorbing roller 4, so as to improve the efficiency of absorbing the liquid on the first surface 22 of the optical film 2.
In an embodiment, the step (b) further includes: at least 1/4 of the circumference of the liquid suction roller 4 is brought into contact with the optical film material 2 to ensure a sufficient contact area between the optical film material 2 and the liquid suction roller 4. Herein, the step (b) may also be selected to perform or synchronously perform the following steps: when the liquid absorbing roller 4 contacts the optical film 2, the tension of the optical film 2 can be between 150N and 250N, so that the liquid absorbing roller 4 can effectively absorb the liquid, such as the treatment liquid and/or the aqueous solution, on the first surface 22 of the optical film 2, thereby preventing the liquid absorbing roller 4 from rotating unsmoothly and the optical film 2 from being scratched, and increasing the yield of the process.
In an embodiment, the step (b) further includes: the position of the liquid suction roller 4 is controlled by the pneumatic cylinder 45 to adjust the contact area between the liquid suction roller 4 and the optical film material 2.
In one embodiment, before the step (c), the method further comprises: a step of pressing the first surface 22 and the second surface 24 of the optical film material 2 by a pair of nip rollers 31 to remove the liquid; and/or blowing gas to the first surface 22 and/or the second surface 24 of the optical film material 2 by the first air knife 32 to remove the liquid; and/or blowing gas to the first surface 22 of the optical film 2 on the roller 34 by the second air knife 33 to remove the liquid.
The liquid removing device and the liquid removing method are provided, and the device used in the preparation process of the optical film material comprises a liquid absorbing roller to remove liquid such as treatment liquid and/or washing liquid remained on the surface of the optical film material. In one embodiment, the inner layer of the liquid absorbing roller is a porous core body, the outermost layer is coated with a water absorbing material, and the liquid on the surface of the optical film material, such as treatment liquid and/or washing liquid, is absorbed through the water absorbing material. In one embodiment, the liquid absorbing roller adopts a negative pressure absorption principle to improve the liquid absorption efficiency. In addition, the sucked liquid can be continuously discharged outwards through the pipeline. Therefore, the liquid absorbing roller has better water absorbing efficiency compared with the prior art, the water absorbing component is not saturated, the production line is required to be interrupted for cleaning, and/or the water absorbing device is required to be replaced, so that the transmission speed of the optical film material can be greatly improved, the production speed is increased, and the length proportion of defective products is reduced to be less than 0.5-1% of the total production length.
For example, when the liquid absorbing roller 4 of the present invention is not installed, the optical film 2 with a length of 1000 m is produced, the transmission speed of the optical film 2 is less than 25 m/min, and the length of the defective product of the optical film 2, for example, the length of the first surface 22 with the excessive liquid remaining therein, is 20-25 m. However, by providing the liquid absorbing roller 4 of the embodiment of the present invention, the transmission speed of the optical film 2 can be increased to 25-60 m/min, and the length of the defective product of the optical film 2 can be reduced to 5-10 m, thereby reducing the defective rate.
Furthermore, the liquid suction roller can be contacted with the optical film material by at least 1/4 of the circumference of the liquid suction roller so as to ensure that the optical film material and the liquid suction roller have enough contact area. Moreover, the liquid suction roller can be further connected to the pneumatic cylinder so as to adjust the contact area of the liquid suction roller and the optical film material. Moreover, when the liquid suction roller contacts the optical film material, the tension of the optical film material is between 150N and 250N, thereby avoiding the unsmooth rotation of the liquid suction roller and preventing the optical film material from being scratched. Therefore, the liquid removing equipment and the liquid removing method provided by the disclosure can effectively remove the liquid remained on the surface of the optical film material. As described above, in the embodiment of the present invention, by selecting and designing the material of the liquid absorbing roller, adjusting the position of the liquid absorbing roller by the pneumatic cylinder, and controlling the tension of the optical film, the liquid absorbing roller can directly contact the optical film, especially the optical film having the functional layer, and efficiently absorb the liquid on the first surface of the optical film having the functional layer without damaging the optical film.
The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A liquid removal apparatus, comprising:
a liquid absorbing roller for contacting and absorbing a liquid on a first surface of an optical film material to make the liquid on the first surface adhere in an amount of 0.01-0.15 g/m2(ii) a And
two fixed guide pulleys, set up in the different sides of this imbibition running roller for this imbibition running roller is greater than 120 with the junction surface angle on this first surface, and when this imbibition running roller and this optical film material contact, the tension of this optical film material is between 150N to 250N, and this imbibition running roller includes:
a core body, which is provided with a solid part and a hollow part; and
a water absorbing material, which covers the core.
2. The fluid removing apparatus as claimed in claim 1, wherein the solid portion has a plurality of through holes, and the water absorbing member covers the plurality of through holes; and/or the solid part is formed by metal, hard plastic or rubber; and/or the water-absorbing material is made of sponge, non-woven fabric, fabric or polyester fiber.
3. The liquid removing device as claimed in claim 1, wherein the diameter of the liquid absorbing roller is 100 to 200 mm; and/or the liquid absorbing roller further comprises a pipeline and a vacuum pump, one end of the pipeline is connected with the vacuum pump, and the other end of the pipeline is connected with the inner edge of the solid part, wherein the vacuum pump is used for pumping the hollow part to enable the pressure of the hollow part to be smaller than the pressure outside the liquid absorbing roller; and/or the liquid suction roller also comprises a vacuum pump, and the vacuum degree of the vacuum pump is between 47kPa and 87 kPa.
4. The apparatus of claim 1, wherein at least 1/4 of the circumference of the suction roller contacts the optical film; and/or the transmission speed of the optical film material is 25-60 m/min.
5. The apparatus of claim 1, further comprising a pneumatic cylinder connected to the suction roller for controlling the position of the suction roller to adjust the contact area between the suction roller and the optical film.
6. The apparatus of claim 1, further comprising a pair of nip rollers for pressing the first surface and a second surface opposite to the first surface of the optical film for removing liquid; and/or
The first air knife is used for blowing gas to the first surface of the optical film material and/or a second surface opposite to the first surface so as to remove liquid; and/or
The second air knife and the roller are respectively arranged at two opposite sides of the optical film, and the second air knife is used for blowing gas to the first surface of the optical film positioned on the roller so as to remove liquid.
7. A method of removing liquid, comprising:
(a) conveying an optical film material through a process bath;
(b) sucking the liquid on the surface of the optical film material by the liquid removing equipment of any one of claims 1 to 6; and
(c) the optical film is dried.
8. The method of claim 7, further comprising providing a surface treatment to the first surface, and after step (c), the first surface has a water contact angle of between 70 ° and 100 °.
9. The method of claim 7, wherein the first surface of the optical film is an uneven surface having a concave-convex shape; and/or the first surface comprises a plurality of light-transmitting particles.
10. The liquid removing method of claim 9, wherein the area ratio of the plurality of light-transmissive particles to the first surface is 30 to 94%; and/or the average particle diameter of the plurality of light-transmitting fine particles is 0.5 to 15.0 μm; and/or the refractive index of the plurality of light-transmissive fine particles is 1.45 to 1.68; and/or the material of the plurality of light-transmitting fine particles is selected from silica inorganic particles, or organic particles selected from silicone resin, polystyrene resin, melamine resin, polyester resin, acrylic resin, olefin resin, or a copolymer thereof.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| TW106109554A TWI695961B (en) | 2017-03-22 | 2017-03-22 | Liquid remove apparatus and liquid remove method |
| TW106109554 | 2017-03-22 |
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| CN106945209A CN106945209A (en) | 2017-07-14 |
| CN106945209B true CN106945209B (en) | 2020-02-21 |
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| CN108332533A (en) * | 2018-01-15 | 2018-07-27 | 李振志 | A kind of textile cloth processing drying unit |
| CN109059501A (en) * | 2018-08-01 | 2018-12-21 | 叶贝贝 | Glass desicator |
| CN109457419B (en) * | 2018-12-29 | 2021-09-14 | 叶德江 | Sizing machine with high drying performance |
| CN109440334B (en) * | 2018-12-29 | 2021-09-24 | 叶江波 | High-performance sizing machine |
| CN109440333B (en) * | 2018-12-29 | 2021-10-22 | 叶江波 | Quick-drying sizing machine |
| CN111525075B (en) * | 2020-04-22 | 2022-06-24 | 乐凯胶片股份有限公司 | Lithium battery diaphragm water trap |
| CN113580441B (en) * | 2021-07-24 | 2023-01-24 | 安徽工程大学 | Film drying device is used in production of electromagnetic shielding membrane |
| CN115027158B (en) * | 2022-07-08 | 2024-01-05 | 美盛文化创意股份有限公司 | Printing equipment |
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| TW201835516A (en) | 2018-10-01 |
| TWI695961B (en) | 2020-06-11 |
| CN106945209A (en) | 2017-07-14 |
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