TWI708675B - Manufacturing method of optical film - Google Patents

Abstract

A lamination system and a manufacturing method of an optical film applying the same are provided. The lamination system includes a lamination device. The lamination device includes a first roller and a second roller arranged opposite to each other for laminating a first optical film and a second optical film to each other for forming a laminated film. The first roller includes a first UV irradiation device for providing a UV light.

Description

Manufacturing method of optical film

This disclosure relates to a lamination system and a manufacturing method of an optical film using it.

Polarizing plates are often used as optical elements constituting liquid crystal display devices. The polarizing plate is an optical film with a multilayer structure. During the manufacturing and bonding process of the multilayer structure, it is possible that the surface of the optical film may form lines on the surface of the optical film due to the transportation process of the optical film, tension and stretching, which may cause defects in the polarizer. .

This disclosure relates to a bonding system and a manufacturing method of an optical film using the bonding system. In the embodiment, the bonding roller includes a first ultraviolet light irradiation device, so when the optical film is bonded, the first ultraviolet light irradiation device can be used to simultaneously irradiate the ultraviolet light curing adhesive between the optical films with ultraviolet light In this way, the flat surface formed after the lamination can be fixed by a partially cured UV-curable adhesive, so it can prevent the formation of lines due to the pulling or tension stretching during the conveying process after lamination. Avoid defects in the laminated film formed by bonding.

According to an embodiment of the disclosure, a bonding system is provided. The bonding system includes a bonding device. The laminating device includes a first laminating roller and a second laminating roller. The first laminating roller and the second laminating roller are arranged opposite to each other for laminating a first optical film and a second Optical film to form a laminated film. The first bonding roller includes a first ultraviolet light irradiation device, and the first ultraviolet light irradiation device is used for providing a first ultraviolet light.

According to another embodiment of the present disclosure, a manufacturing method of an optical film is provided. The manufacturing method of the optical film includes the following steps: providing a first optical film and a second optical film; coating an ultraviolet curable adhesive on the first optical film or the second optical film; and laminating simultaneously And providing a first ultraviolet light to the first optical film and a second optical film to form a laminated film.

In order to have a better understanding of the above and other aspects of the present invention, the following specific examples are given in conjunction with the accompanying drawings to describe in detail as follows:

1. 1A, 1B: Laminating system

10: Fitting device

100, 100A: the first bonding roller

110: Outer hollow roller

120: The first ultraviolet light irradiation device

130: inner fixed roller

130r: groove

130s: opening

131: End

132: main body

140: fixed shaft

150: bearing

160: filter

160A, 160B, 160C: area

170: fixed frame

200: The second bonding roller

300, 310: Coating device

400, 410: UV curing adhesive

500: laminated film

510: The first optical film

520: second optical film

530: The third optical film

600: cooling roller

700: The second ultraviolet light irradiation device

800, 810: pressing roller

D1: Conveying direction

d1, d2: outer diameter

L1: length

W1: width

FIG. 1 is a schematic diagram of a bonding system according to an embodiment of the disclosure.

FIG. 1A is a schematic diagram of a bonding system according to another embodiment of the disclosure.

FIG. 1B is a schematic diagram of a bonding system according to a further embodiment of the disclosure.

FIG. 2A is a schematic cross-sectional view of the first laminating roller along the X-Z plane according to an embodiment of the disclosure.

Figure 2B is a schematic cross-sectional view of the first laminating roller along the Y-Z plane according to an embodiment of the disclosure.

FIG. 3A shows a side view of the inner fixed roller along the Y-Z plane according to an embodiment of the disclosure.

Figure 3B shows a side view of the outer hollow roller along the Y-Z plane according to an embodiment of the present disclosure.

In the embodiment of the present disclosure, the bonding roller includes a first ultraviolet light irradiation device. When the optical film is bonded, the first ultraviolet light irradiation device can be used to simultaneously perform the ultraviolet curing adhesive between the optical films. UV light irradiation, in this way, the flat surface formed after bonding can be fixed by a partially cured UV-curable adhesive, so it can be prevented from being formed by pulling or tension stretching during the conveying process after bonding. Textures, and avoid defects in the laminated film formed by bonding.

Various embodiments are provided below for detailed description. The embodiments are only used as examples for description, and do not limit the scope of the present invention. In the different embodiments and drawings, the same elements will be represented by the same element symbols. It should be noted that these specific embodiments are not intended to limit the present invention. The present invention can still be implemented using other features, elements, methods and parameters. The embodiments are only used to illustrate the technical features of the present invention, and not to limit the scope of patent application of the present invention. Those with ordinary knowledge in this technical field will be able to make equivalent modifications and changes based on the description in the following specification without departing from the spirit of the present invention. In addition, some elements are omitted from the drawings in the embodiments to clearly show the technical features of the present invention.

FIG. 1 is a schematic diagram of a bonding system 1 according to an embodiment of the disclosure. As shown in FIG. 1, the laminating system 1 may include a laminating device 10, coating devices 300 and 310, a cooling roller 600 and a second ultraviolet light irradiation device 700. The laminating device 10 includes a first laminating roller 100 and a second laminating roller 200. The first laminating roller 100 and the second laminating roller 200 are arranged opposite to each other for laminating a first optical The film 510, a third optical film 530 and a second optical film 520 form a laminated film 500.

The first laminating roller 100 includes a first ultraviolet light irradiation device 120 for providing a first ultraviolet light. In detail, as shown in Figure 1, in the embodiment, the first optical film 510, the third optical film 530, and the second optical film 520 pass between the first bonding roller 100 and the second bonding roller 200 , By squeezing the first bonding roller 100 and the second bonding roller 200 to bond each other, the first ultraviolet light irradiation device 120 bonds the first optical film 510, the third optical film 530 and the second The optical film 520 provides a first ultraviolet light at the same time, and irradiates the ultraviolet light curing adhesive between the first optical film 510, the third optical film 530, and the second optical film 520 with ultraviolet light, so that part of the ultraviolet light can be cured. Light-curing adhesive. In this way, the flat surfaces formed when the first optical film 510, the third optical film 530, and the second optical film 520 are bonded can be fixed by the partially cured ultraviolet light-curable adhesive, so that it can prevent Lines are formed due to the pulling or tension stretching during the conveying process after lamination, thereby avoiding defects of the laminated film 500.

In some embodiments, the first laminating roller 100 may include an outer hollow roller 110, and the first ultraviolet light irradiation device 120 is disposed in the outer hollow roller 110.

In some embodiments, as shown in Figure 1, the laminating system 1 may include a second ultraviolet light irradiation device 700, which is used to provide a second ultraviolet light irradiation device 700. Light. As shown in FIG. 1, the second ultraviolet light irradiation device 700 is located downstream of the laminating device 10; that is, the second ultraviolet light irradiation device 700 is arranged after the first ultraviolet light irradiation device 120 along the conveying direction D1. Specifically, after the optical film passes through the first laminating roller 100 and the second laminating roller 200, the laminated film 500 at this time has a partially cured ultraviolet light-curable adhesive, and is then transported to the second ultraviolet light The irradiation device 700 performs further ultraviolet light irradiation with the second ultraviolet light to completely cure the ultraviolet light-curable adhesive to produce a completely shaped laminate film 500 with a flat surface.

In some embodiments, the first optical film 510 and the third optical film 530 are, for example, protective films, and the protective films may have a single-layer or multi-layer structure. The material of the protective film can be, for example, a thermoplastic resin with excellent transparency, mechanical strength, thermal stability, and moisture barrier properties. Thermoplastic resins may include cellulose resins (e.g., Triacetate Cellulose (TAC), Diacetate Cellulose (DAC)), acrylic resins (e.g., Poly(methyl methacrylate) ), PMMA), polyester resin (for example, polyethylene terephthalate (PET), polyethylene naphthalate), olefin resin, polycarbonate resin, cycloolefin resin, oriented stretch Oriented-Polypropylene (OPP), Polyethylene (PE), Polypropylene (PP), Cyclic Olefin Polymer (COP), Cyclic Olefin Copolymer (COC) ), or any combination of the above. In addition, the above-mentioned protective film may be further subjected to surface treatment, for example, anti-glare treatment, anti-reflection treatment, hard coating treatment, electrification prevention treatment or anti-fouling treatment. In one embodiment, The first optical film 510 and the third light The optical film 530 can be a film layer that is beneficial to optical gain, alignment, compensation, steering, orthogonality, diffusion, anti-sticking, scratch resistance, anti-glare, reflection suppression, high refractive index, etc., such as a retardation film.

The second optical film 520 is, for example, a polarizing film, and the material of the polarizing film can be a polyvinyl alcohol (PVA) resin film, which can be made by saponifying polyvinyl acetate resin. Examples of polyvinyl acetate resins include a single polymer of vinyl acetate, namely polyvinyl acetate, a copolymer of vinyl acetate, and other monomers that can be copolymerized with vinyl acetate.

In detail, in the case where the first optical film 510 and the third optical film 530 are bonded to the second optical film 520 through a UV-curable adhesive, when passing through the bonding roller, if they are not UV-cured The procedure of the partial curing of the adhesive, for example: irradiate ultraviolet light, then the transparent triacetyl cellulose film and the polyvinyl alcohol-based polarizing film are laminated and transported to the rear end. At this time, the ultraviolet curable adhesive is not cured yet. With any viscosity, the PVA-based polarizing film is being transported during the transportation process, for example, before it is transported to the ultraviolet light irradiation device, it is stretched by tension and other factors, causing the original flat surface of the film to form lines again. This in turn causes defects in the polarizer. In contrast, according to the embodiments of the present disclosure, the first ultraviolet light is provided at the same time when laminating the transparent triacetyl cellulose film and the polarizing film of polyvinyl alcohol to cure part of the ultraviolet light-curable adhesive, and partly cure The UV-curable adhesive has a high viscosity, which can shape the flat surface formed by the transparent triacetyl cellulose film and the polyvinyl alcohol-based polarizing film after bonding, so it can prevent the The pulling or tension stretching during the conveying process forms lines, thereby avoiding the occurrence of defects of the polarizer.

As shown in Figure 1, in the embodiment, the first laminating roller 100 may further include an inner fixed roller 130, and the inner fixed roller 130 is disposed in the outer hollow roller 110, The inner fixed roller 130 has a groove 130r, and an opening 130s of the groove 130r faces the laminated film 500, and the first ultraviolet light irradiation device 120 is disposed in the groove 130r. That is, the opening 130s of the groove 130r faces the position where the optical film is bonded between the first bonding roller 100 and the second bonding roller 200. In some embodiments, the groove 130r has two side surfaces, and the first ultraviolet light irradiation device 120 is sandwiched between the two side surfaces of the groove 130r, and the angle between the two side surfaces may be between 30 and 45 degrees.

In some embodiments, the first ultraviolet light irradiation device 120 and the second ultraviolet light irradiation device 700 are devices capable of emitting wavelengths between 200 nanometers (nm) and 380 nanometers, such as low-pressure mercury lamps, medium-pressure mercury lamps, and high-pressure mercury lamps. , Ultra-high pressure mercury lamp, chemical lamp, black light lamp, microwave excited mercury lamp or metal halide lamp, etc.

In the embodiment, as shown in Figure 1, the outer hollow roller 110 is transparent, and the material of the inner fixed roller 130 is opaque. The first ultraviolet light emitted by the first ultraviolet light irradiation device 120 is emitted from the opening 130s And irradiated onto the laminated film 500 through the outer hollow roller 110. In other words, the non-transmissive nature of the inner fixed roller 130 and the groove structure limit the irradiation range of the first ultraviolet light to only emitted from the opening 130s. Therefore, the first ultraviolet light only irradiates the optical film that needs to be partially cured. The first bonding roller 100 will be emitted from other directions, which can also avoid the problem of the operator being irradiated by the first ultraviolet light.

In some embodiments, the outer hollow roller 110 is, for example, a transparent glass hollow roller, and the material of the inner fixed roller 130 is, for example, stainless steel, plastic steel, or titanium alloy. The material of the second bonding roller 200 is, for example, stainless steel, plastic steel, or titanium alloy. In some embodiments, the outer layer of the second laminating roller 200 may be covered with a layer of anti-ultraviolet light buffer material, such as rubber, foam, or plastic, for laminating the first optics with the first laminating roller 100 Film 510, The second optical film 520 and the third optical film 530 provide a buffering effect to avoid defects, but the content of the disclosure is not limited thereto. In some embodiments, the second bonding roller 200 may also include another ultraviolet light irradiation device (not shown), and provide ultraviolet light simultaneously with the first ultraviolet light irradiation device 120. In this case, the second bonding roller The design of 200 can be the same as that of the first laminating roller 100, which will not be repeated here.

As shown in Figure 1, the first laminating roller 100 may further include a fixed shaft 140 connected to the inner fixed roller 130, the inner fixed roller 130 is fixed to the fixed shaft 140, and the outer hollow roller The wheel 110 can rotate around a fixed shaft 140.

In an embodiment, as shown in Figure 1, the first laminating roller 100 may further include a bearing 150, which connects the inner fixed roller 130 and the outer hollow roller 110, and the bearing 150 is used to drive the outer hollow roller 110 rotates around a fixed shaft 140. For example, the bearing 150 is, for example, a ball bearing.

In an embodiment, as shown in FIG. 1, the laminating system 1 may include a coating device 300 for coating an ultraviolet curable adhesive 400 on the first optical film 510. In the embodiment, the coating device 300 is located upstream of the laminating device 10; that is, the coating device 300 is disposed before the first ultraviolet light irradiation device 120 along a conveying direction D1.

In some embodiments, as shown in Figure 1, the laminating system 1 may further include a second coating device 310, and the coating device 310 may be used to coat a UV curable adhesive 410 on a third optical film 530 on.

FIG. 1A is a schematic diagram of a bonding system according to another embodiment of the disclosure, and FIG. 1B is a schematic diagram of a bonding system according to a further embodiment of the disclosure. this In the embodiment, the same or similar component numbers are used for the same or similar component numbers as in the previous embodiment, and the related description of the same or similar components please refer to the foregoing, and will not be repeated here.

In some embodiments, as shown in FIG. 1A, in the laminating system 1A, the coating device 300 is located upstream of the laminating device 10, and the coating device 300 can be used to coat the UV-curable adhesive 400 on the second On the optical film 520.

In other embodiments, as shown in FIG. 1B, in the laminating system 1B, the coating devices 300 and 310 may be respectively disposed on two opposite surfaces of the second optical film 520 for curing the ultraviolet light The agent is coated on the second optical film 520. In an embodiment, the first optical film 510, the second optical film 520, and the third optical film 530 can pass between the first bonding roller 100 and the second bonding roller 200 together to be bonded to form a three-layer When laminating the first optical film 510, the second optical film 520, and the third optical film 530, the first ultraviolet light irradiation device 120 can simultaneously provide a first ultraviolet light to the first optical film 500. The ultraviolet curable adhesive 400 between 510 and the second optical film 520 and the ultraviolet curable adhesive 410 between the second optical film 520 and the third optical film 530 are irradiated with ultraviolet light, and the ultraviolet light can be partially cured Curing type adhesives 400 and 410. As mentioned above, the flat surface formed after the lamination can be fixed by the partially cured UV-curable adhesives 400 and 410, which can prevent the pulling or tension during the conveying process after lamination. Stretching to form textures, thereby avoiding the occurrence of defects in the laminated film 500.

In some embodiments, the laminating device 10 may further include at least one pressing roller, the pressing roller contacts and provides a pressure to at least one of the first laminating roller 100 and the second laminating roller 200. As shown in Figure 1, in the embodiment, the laminating device 10 may include two The pressing rollers 800 and 810, the pressing roller 800 and the pressing roller 810 respectively contact the first laminating roller 100 and the second laminating roller 200, and one of the pressing rollers 800 and 810 can provide pressure to the corresponding The contacting lamination roller achieves the effect of pressure lamination to improve the surface flatness of the laminated film 500. In some embodiments, the pressing roller 800 and/or the second bonding roller 200 may also be a cooling roller. For example, the structure may be a roller with a hollow structure, and the cooling gas or cooling liquid is passed through. Into the cavity inside the hollow structure to achieve the effect of cooling the first optical film 510, and/or the second optical film 520, and/or the third optical film 530.

In some embodiments, as shown in FIG. 1, the laminating system 1 may include a cooling roller 600, and the second ultraviolet light irradiation device 700 is provided corresponding to the outer peripheral surface of the cooling roller 600. As shown in FIG. 1, the cooling roller 600 is located downstream of the laminating device 10; that is, the cooling roller 600 is arranged behind the first ultraviolet light irradiation device 120 along the conveying direction D1. The cooling roller 600 is used to assist in cooling the laminated film 500 so as to prevent the laminated film 500 from being damaged by the high temperature generated by the ultraviolet light with too much energy.

Figure 2A is a schematic cross-sectional view of the first laminating roller along the XZ plane according to an embodiment of the present disclosure, and Figure 2B is a cross-sectional view of the first laminating roller along the YZ plane according to an embodiment of the present disclosure Schematic diagram, Figure 3A shows a side view of the inner fixed roller along the YZ plane according to an embodiment of the present disclosure, and Figure 3B shows a side view of the outer hollow roller along the YZ plane according to an embodiment of the present disclosure . In this embodiment, the same or similar component numbers are used for the same or similar component numbers as in the previous embodiments, and the related description of the same or similar components please refer to the foregoing, and will not be repeated here. It should be noted that, in Figures 3A to 3B, only part of the structural features are presented in perspective and indicated by dashed lines.

As shown in Figure 2A, in this embodiment, in the first laminating roller 100A, the groove 130r has, for example, a concave arc surface, and the first ultraviolet light irradiation device 120 can pass through the fixing member (not shown) It is fixed on the surface of the groove 130r. In addition, the opening 130s of the groove 130r is smaller than the inner diameter of the groove 130r, and the size of the opening 130s defines the direction and range of the first ultraviolet light emitted.

As shown in Figures 2A to 2B, the opening 130s has a length L1 along the axial direction of the first laminating roller 100A, and the length L1 is 1500~2500 millimeters (mm). The opening 130s is perpendicular to the first laminating roller. The roller 100A has a width W1 in the axial direction, and the width W1 is 10-20 mm.

Moreover, in some embodiments, the length L1 of the opening 130s is, for example, greater than or equal to the width of the laminated film 500, which can provide ultraviolet light to a larger area of the laminated film 500 to achieve a relatively complete partial curing effect.

As shown in FIG. 2B, the inner fixed roller 130 has at least one end 131 and a main body 132. The end 131 is connected to the main body 132, and the outer diameter d1 of the end 131 is smaller than the outer diameter d2 of the main body 132. In an embodiment, the bearing 150 may be disposed on the end 131 of the inner fixed roller 130, and the outer hollow roller 110 is connected to the bearing 150 and the main body 132 of the inner fixed roller 130. Thereby, the outer hollow roller 110 can be driven by the bearing 150 to move around the fixed shaft 140, and the inner fixed roller 130 can be fixed on the fixed shaft 140. As a result, the outer hollow roller 110 can continue to rotate to drive the optical film (such as the first optical film 510 in Figure 1) forward, and the groove 130r of the inner fixed roller 130 and the first ultraviolet light irradiation device 120 remain It can maintain the same position and irradiate the optical film with first ultraviolet light.

In some embodiments, as shown in FIGS. 2A to 2B, the first laminating roller 100A may further optionally include a filter 160. The filter 160 is disposed at the opening 130s of the groove 130r. The light passes through the filter 160 before being emitted from the opening 130s. In an embodiment, the first laminating roller 100A may further include a fixing frame 170, and the filter 160 is fixed on the inner fixed roller 130 via the fixing frame 170.

In some embodiments, as shown in FIG. 2B, the length of the filter 160 is, for example, the same as the length L1 of the opening 130s. In some embodiments, as shown in FIG. 2B, the filter 160 has multiple regions along the length L1 of the opening 130s (this embodiment shows three regions, regions 160A, 160B, and 160C, but the disclosure does not Limited to this), and the light transmittance and/or light transmittance wavelength range of these regions are different. For example, in the embodiment shown in FIG. 2B, the light transmittance of area 160C is greater than that of area 160B, and the light transmittance of area 160B is greater than that of area 160A, but the present disclosure The content is not limited to this. The number of regions of the filter 160 and the size relationship of the light transmittance of each region and/or the configuration of the light penetration wavelength range can be adjusted and changed according to actual needs. Through the design of the filter 160, the light output of the first ultraviolet light irradiation device 120 along the length L1 of the opening 130s can be adjusted, for example, the light output and/or the wavelength range of the light penetrated can be adjusted.

The present disclosure further provides a manufacturing method of an optical film. The manufacturing method of the optical film of the present disclosure can be implemented by applying the aforementioned bonding system.

According to some embodiments of the present disclosure, the manufacturing method of the optical film may include the following steps: providing a first optical film and a second optical film; coating a UV-curable adhesive on the first optical film or the second optical film On the optical film; and simultaneously bonding and providing a first ultraviolet light on the first optical film and the second optical film to form a laminated film.

Hereinafter, referring to FIG. 1, a method of manufacturing an optical film according to an embodiment of the disclosure will be described. The embodiments are only used as examples for description, and do not limit the scope of the present invention to be protected.

As shown in FIG. 1, an ultraviolet curable adhesive 400 is coated on the first optical film 510 by the coating device 300. In an embodiment, an ultraviolet curable adhesive 410 can be selectively coated on the third optical film 530 by the coating device 310. According to some other embodiments, please refer to Figures 1A to 1B. At this stage, the coating device 300 can also coat the UV-curable adhesive 400 on the second optical film 520, or the coating device 300 and 310 can respectively apply The ultraviolet curable adhesives 400 and 410 are coated on two opposite surfaces of the second optical film 520.

Next, along the conveying direction D1, the first optical film 510, the second optical film 520, and/or the third optical film 530 are conveyed between the first bonding roller 100 and the second bonding roller 200 for bonding to form A laminated film 500. In the embodiment, one of the pressing rollers 800 and 810 can be selectively contacted and a pressure is applied to at least one of the first laminating roller 100 and the second laminating roller 200 to perform pressure Bonding can improve the surface flatness of the optical film.

When bonding the first optical film 510, the second optical film 520 and/or the third optical film 530, the first ultraviolet light irradiation device 120 is used to provide a first ultraviolet light to irradiate the first optical film 510 and the second optical film 520. And/or the third optical film 530. In an embodiment, the irradiation time of the first ultraviolet light is, for example, 0.01 to 0.05 seconds, and/or the energy intensity of the first ultraviolet light is, for example, 10 to 100 millijoules/cm 2 (mj/cm ² ), and/or the first The illuminance of the ultraviolet light is, for example, 10 to 700 milliwatts per square centimeter (mw/cm ² ).

After being irradiated with the first ultraviolet light, the ultraviolet curable adhesive 400 and/or 410 on the first optical film 510, the second optical film 520, and/or the third optical film 530 is partially cured. In an embodiment, the curing and crosslinking reaction rate of the ultraviolet curable adhesive caused by the first ultraviolet light is equal to or less than 40%, preferably between 10-20%.

According to the embodiment of the present disclosure, the first ultraviolet light is only used to provide partial curing. At this time, the ultraviolet curable adhesive has a certain degree of viscosity, which is beneficial to the setting of the flat film surface, but because it is not completely cured, At this time, the overall structure of the first optical film 510, the second optical film 520, and/or the third optical film 530 is not too hard or too brittle, which may cause damage or deformation during the subsequent transportation or manufacturing process.

Then, after irradiating with the first ultraviolet light, a second ultraviolet light is provided to the laminated film 500. For example, in an embodiment, after the first optical film 510, the second optical film 520, and the third optical film 530 form the laminated film 500, they can be transported to the second ultraviolet light irradiation device 700 along the transport direction D1, and the second ultraviolet light The light irradiation device 700 provides a second ultraviolet light to irradiate the ultraviolet light-curable adhesive 400 and/or 410 in the laminated film 500 to completely cure the ultraviolet light-curable adhesive 400 and/or 410, and make it into a completely shaped and have Laminated film 500 with a flat surface. In an embodiment, the distance between the second ultraviolet light irradiation device 700 and the laminated film 500 is 200-300 mm.

In an embodiment, the irradiation time of the second ultraviolet light is, for example, 1 to 2.5 seconds, and/or the energy intensity of the second ultraviolet light is, for example, 120 to 300 millijoules/cm 2 (mj/cm ² ), and/or the second The illuminance of the ultraviolet light is, for example, 1000 to 4000 milliwatts/cm 2 (mw/cm ² ).

Specifically, because the ultraviolet light will produce high temperature, the irradiation time of the first ultraviolet light should not be too long, and/or the energy intensity should not be too large, so as to avoid the first UV When the optical film 510, the second optical film 520, and the third optical film 530 generate high temperature, the above-mentioned optical film is damaged. On the other hand, in order to completely cure the UV-curable adhesive, the irradiation time of the second UV light needs to be maintained at a certain time, and/or the energy intensity needs to be maintained at a certain intensity.

Accordingly, in some embodiments, the irradiation time of the second ultraviolet light is greater than the irradiation time of the first ultraviolet light, and/or the energy intensity of the second ultraviolet light is greater than the energy intensity of the first ultraviolet light, and/or the second ultraviolet light The illuminance of the light is greater than the illuminance of the first ultraviolet light, so that the second optical film 520 can be fixed to the first optical film 510 and/or by the partially cured ultraviolet light-curable adhesive 400 and/or 410 during pressure bonding. Or the third optical film 530 to prevent the second optical film 520 from being pulled or stretched by tension during the backward conveying process to form lines on the second optical film 520, and at the same time to prevent the second optical film 520 from being damaged due to high temperature during pressure bonding . Then, the second ultraviolet light is passed through to completely cure the ultraviolet-curable adhesives 400 and/or 410, so as to produce a completely shaped laminate film 500 with a flat surface.

In some embodiments, when the second ultraviolet light is provided, the laminated film 500 can be cooled at the same time, for example, by using the cooling roller 600 in FIG. 1 to prevent the laminated film 500 from being damaged due to high temperature.

In summary, although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Those who have ordinary knowledge in the technical field to which the present invention belongs 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 subject to those defined by the attached patent application scope.

1: Fitting system

10: Fitting device

100: The first bonding roller

110: Outer hollow roller

120: The first ultraviolet light irradiation device

130: inner fixed roller

130r: groove

130s: opening

140: fixed shaft

150: bearing

200: The second bonding roller

300, 310: Coating device

400, 410: UV curing adhesive

500: laminated film

510: The first optical film

520: second optical film

530: The third optical film

600: cooling roller

700: The second ultraviolet light irradiation device

800, 810: pressing roller

D1: Conveying direction

Claims (5)

A method for manufacturing an optical film includes: providing a first optical film and a second optical film; coating an ultraviolet curable adhesive on the first optical film or the second optical film; A laminating roller and a second laminating roller squeeze the first optical film and the second optical film, wherein the first first laminating roller includes an inner fixed roller, and the inner fixed The roller has a groove; when the first laminating roller and the second laminating roller squeeze the first optical film and the second optical film, a first ultraviolet light irradiation device is used to provide a first Ultraviolet light is applied to the first optical film and the second optical film to allow the first optical film to pass through the ultraviolet light-curable adhesive while being attached to the second optical film to form a multilayer film, wherein the The first ultraviolet light irradiation device is disposed in the groove, and the groove has two side surfaces, the first ultraviolet light irradiation device is sandwiched between the two side surfaces of the groove, and the two sides The included angle of the surface is between 30 and 45 degrees; and/or the opening has a length along the axial direction of the first bonding roller, and the opening has a width along the axial direction perpendicular to the first bonding roller, wherein The length is 1500~2500 mm, and/or the width is 10~20 mm; and after the first ultraviolet light is provided, and when the plurality of laminated films are attached to a cooling roller, a first Two ultraviolet rays are applied to the plurality of laminated films. According to the manufacturing method of the optical film described in claim 1, wherein the first ultraviolet light system makes the curing crosslinking reaction rate of the ultraviolet curable adhesive equal to or less than 40%. According to the method of manufacturing the optical film described in claim 1, wherein the irradiation time of the second ultraviolet light is greater than the irradiation time of the first ultraviolet light, and/or the energy intensity of the second ultraviolet light is greater than that of the first ultraviolet light. The energy intensity of the ultraviolet light, and/or the illuminance of the second ultraviolet light is greater than the illuminance of the first ultraviolet light. According to the manufacturing method of the optical film described in item 1 of the scope of patent application, the irradiation time of the second ultraviolet light is 1 to 2.5 seconds, and/or the energy intensity of the second ultraviolet light is 120 to 300 mJ/ Cm², and/or the illuminance of the second ultraviolet light is, for example, 1000~4000 mW/cm². The method for manufacturing an optical film as described in item 1 of the scope of patent application, wherein the irradiation time of the first ultraviolet light is 0.01 to 0.05 seconds, and/or the energy intensity of the first ultraviolet light is 10 to 100 mJ/square Cm, and/or the illuminance of the first ultraviolet light is, for example, 10 to 700 mW/cm².

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