CN107450122B

CN107450122B - Bonding system and method for manufacturing optical film using same

Info

Publication number: CN107450122B
Application number: CN201710947623.3A
Authority: CN
Inventors: 郑信发; 林春辉
Original assignee: Sumika Technology Co Ltd
Current assignee: Sumika Technology Co Ltd
Priority date: 2017-08-16
Filing date: 2017-10-12
Publication date: 2020-08-25
Anticipated expiration: 2037-10-12
Also published as: TWI708675B; CN107450122A; TW201910107A

Abstract

A bonding system and a method for manufacturing an optical film using the same are provided. The attaching system comprises an attaching device. The laminating device comprises a first laminating roller and a second laminating roller, wherein the first laminating roller and the second laminating roller are arranged oppositely and are used for laminating a first optical film and a second optical film to form a laminated film. The first laminating roller comprises a first ultraviolet irradiation device which is used for providing a first ultraviolet light.

Description

Bonding system and method for manufacturing optical film using same

Technical Field

The disclosure relates to a bonding system and a method for manufacturing an optical film using the same.

Background

A polarizing plate is often used as an optical component constituting a liquid crystal display device. The polarizer is an optical film with a multilayer structure, and when the manufacturing and bonding process of the multilayer structure is performed, lines may be formed on the surface of the optical film due to the factors such as the conveying process of the optical film and the tension stretching, thereby causing defects of the polarizer.

Disclosure of Invention

In order to achieve the above object, the present invention provides a method and a system for manufacturing a polarizing film, so as to solve the defect that the surface of an optical film in the prior art is easy to form lines.

The disclosure relates to a bonding system and a method for manufacturing an optical film using the same. In the embodiment, the laminating roller comprises a first ultraviolet irradiation device, so when the optical films are laminated, ultraviolet irradiation can be simultaneously carried out on the ultraviolet curing type adhesive between the optical films by the first ultraviolet irradiation device, and thus, a flat surface formed after lamination can be fixed by the partially cured ultraviolet curing type adhesive, so that grains can be prevented from being formed by pulling or tension stretching in the process of conveying backwards after lamination, and the laminated film formed by lamination can be prevented from generating defects.

According to an embodiment of the present disclosure, a bonding system is provided. The attaching system comprises an attaching device. The laminating device comprises a first laminating roller and a second laminating roller, wherein the first laminating roller and the second laminating roller are arranged oppositely and are used for laminating a first optical film and a second optical film to form a laminated film. The first laminating roller comprises a first ultraviolet irradiation device which is used for providing a first ultraviolet light.

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

In order to better understand the above and other aspects of the present invention, the following detailed description of the embodiments is made with reference to the accompanying drawings:

drawings

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

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

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

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

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

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

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

Wherein, the reference numbers:

1. 1A, 1B: laminating system

10: laminating device

100. 100A: first laminating roller

110: outer layer hollow roller

120: first ultraviolet irradiation device

130: inner layer fixed roller

130 r: groove

130 s: opening of the container

131: end part

132: main body part

140: fixed shaft

150: bearing assembly

160: optical filter

160A, 160B, 160C: region(s)

170: fixing frame

200: second laminating roller

300. 310: coating device

400. 410: ultraviolet-curable adhesive

500: laminated film

510: first optical film

520: second optical film

530: third optical film

600: cooling roller

700: second ultraviolet irradiation device

800. 810: press roller

D1: direction of conveyance

d1, d 2: diameter of outer periphery

L1: length of

W1: width of

Detailed Description

In an embodiment of the disclosure, the bonding roller includes a first ultraviolet irradiation device, and when the optical films are bonded, the first ultraviolet irradiation device can be used for irradiating ultraviolet light to the ultraviolet light curing type adhesive between the optical films at the same time, so that the flat surface formed after bonding can be fixed by the partially cured ultraviolet light curing type adhesive, thereby preventing lines from being formed due to pulling or tension stretching in the process of conveying the bonded film backwards, and further preventing the bonded laminated film from generating defects.

Various embodiments are presented in the following detailed description, which is only used as an example to illustrate and not to limit the scope of the invention to be protected. In the different embodiments and drawings, the same components will be denoted by the same reference numerals. It should be noted that the specific embodiments are not intended to limit the invention. The invention may be embodied with other features, components, methods, and parameters. The embodiments are provided only for illustrating the technical features of the present invention, and not for limiting the claims of the present invention. Those skilled in the art will recognize that equivalent modifications and variations can be made in light of the following description without departing from the spirit of the invention. In addition, some components are omitted from the drawings in the embodiments to clearly show the technical features of the present invention.

Fig. 1 is a schematic view illustrating a bonding system 1 according to an embodiment of the disclosure. As shown in fig. 1, the coating system 1 may include a coating device 10,

coating devices

300 and 310, a cooling roller 600, and a second ultraviolet irradiation device 700. The laminating apparatus 10 includes a first laminating roller 100 and a second laminating roller 200, wherein the first laminating roller 100 and the second laminating roller 200 are disposed opposite to each other for laminating a first optical film 510, a third optical film 530 and a second optical film 520 to form a laminated film 500.

The first bonding roller 100 includes a first ultraviolet irradiation device 120 for providing a first ultraviolet light. In detail, as shown in fig. 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, and are bonded to each other by the pressing of the first bonding roller 100 and the second bonding roller 200, the first ultraviolet irradiation device 120 simultaneously provides a first ultraviolet light when bonding the first optical film 510, the third optical film 530 and the second optical film 520, and irradiates the ultraviolet light on the ultraviolet light curing type adhesive between the first optical film 510, the third optical film 530 and the second optical film 520, so as to cure part of the ultraviolet light curing type 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 uv-curable adhesive, so that the formation of lines due to pulling or tension stretching in the process of being transported backward after bonding can be prevented, and the occurrence of defects in the laminated film 500 can be avoided.

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

In some embodiments, as shown in fig. 1, the laminating system 1 may include a second ultraviolet light irradiation device 700, and the second ultraviolet light irradiation device 700 is configured to provide a second ultraviolet light. As shown in fig. 1, the second ultraviolet irradiation device 700 is located downstream of the bonding device 10; that is, the second ultraviolet light irradiation device 700 is disposed behind 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 having the partially cured uv curable adhesive therein is then conveyed to the second uv irradiation device 700, and is further irradiated with the second uv light to completely cure the uv curable adhesive, thereby manufacturing the completely shaped laminated film 500 having a flat surface.

In some embodiments, the first optical film 510 and the third optical film 530 are, for example, protective films, which may be single-layer or multi-layer structures. The material of the protective film may be, for example, a thermoplastic resin excellent in transparency, mechanical strength, thermal stability, moisture barrier property, and the like. The thermoplastic resin may include a Cellulose resin (e.g., Triacetylcellulose (TAC), Diacetylcellulose (DAC)), an acrylic resin (e.g., polymethyl methacrylate (PMMA)), a polyester resin (e.g., Polyethylene Terephthalate (PET), Polyethylene naphthalate), an Olefin resin, a polycarbonate resin, a cycloolefin resin, Oriented-tensile Polypropylene (OPP), Polyethylene (PE), Polypropylene (PP), a cycloolefin Polymer (COP), a cycloolefin Copolymer (COC), or any combination thereof, and further, surface treatment of the protective film, e.g., anti-glare treatment, anti-reflection treatment, hard coating treatment, anti-electrification preventing treatment, or the like, in one embodiment, the first optical film 510 and the third optical film 530 may be films that help with optical gain, alignment, compensation, turning, orthogonality, diffusion, anti-sticking, scratch-resistant, anti-glare, reflection suppression, high refractive index, and the like, such as retardation films.

The second optical film 520 is, for example, a polarizing film made of a polyvinyl alcohol (PVA) resin film, which can 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.

Specifically, when the first optical film 510 and the third optical film 530 are bonded to the second optical film 520 through the uv curable adhesive, if the first optical film and the third optical film are not partially cured by the uv curable adhesive while passing through the bonding rollers, for example: irradiating ultraviolet light, attaching the triacetyl cellulose transparent film and the polyvinyl alcohol polarizing film and conveying the triacetyl cellulose transparent film and the polyvinyl alcohol polarizing film to the rear end, wherein the ultraviolet light curing adhesive is not cured and has no viscosity, so that the polyvinyl alcohol polarizing film is conveyed in the conveying process, for example: before being conveyed to an ultraviolet irradiation device, the film material is subjected to factors such as tension and stretching, so that the flat surface of the originally adhered film material forms grains again, and further the defects of the polarizing plate are caused. In contrast, according to the embodiments of the present disclosure, when the triacetyl cellulose transparent film and the polyvinyl alcohol-based polarizing film are bonded, the first ultraviolet light is simultaneously provided to cure a portion of the ultraviolet-curable adhesive, and the partially-curable ultraviolet-curable adhesive has a high viscosity, which can shape the flat surface formed after the triacetyl cellulose transparent film and the polyvinyl alcohol-based polarizing film are bonded, so that the formation of the texture due to pulling or tensile stretching during the backward transportation process after the bonding can be prevented, thereby preventing the generation of the defects of the polarizing plate.

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

In some embodiments, the first and second

uv irradiation devices

120 and 700 are devices capable of emitting light with a wavelength between 200 nanometers (nm) and 380 nm, such as low-pressure mercury lamps, medium-pressure mercury lamps, high-pressure mercury lamps, ultra-high pressure mercury lamps, chemical lamps, black-light lamps, microwave-excited mercury lamps, metal halide lamps, and the like.

In an embodiment, as shown in fig. 1, the outer layer hollow roller 110 is transparent, the material of the inner layer fixed roller 130 is non-transparent, and the first ultraviolet light emitted from the first ultraviolet light irradiation device 120 is emitted from the opening 130s and irradiated onto the laminated film 500 through the outer layer hollow roller 110. That is, the non-light-transmitting property and the groove structure of the inner layer fixing roller 130 limit the irradiation range of the first ultraviolet light to be emitted only from the opening 130s, so that the first ultraviolet light only irradiates the optical film to be partially cured, and does not emit the first attaching roller 100 from other directions, and the problem that an operator is irradiated by the first ultraviolet light can be avoided.

In some embodiments, the outer hollow roller 110 is, for example, a transparent glass hollow roller, and the inner fixed roller 130 is, for example, stainless steel, plastic steel, or titanium alloy. The second bonding roller 200 is made of stainless steel, plastic steel, or titanium alloy, for example. In some embodiments, the outer layer of the second bonding roller 200 may be coated with a layer of ultraviolet-resistant buffer material, such as rubber, foam, or plastic, to provide a buffer effect when the first bonding roller 100 is pressed on the first optical film 510, the second optical film 520, and the third optical film 530, so as to avoid defects, but the disclosure is not limited thereto. In some embodiments, the second bonding roller 200 may also include another ultraviolet irradiation device (not shown), and provides ultraviolet light simultaneously with the first ultraviolet irradiation device 120, and at this time, the design of the second bonding roller 200 may be the same as that of the first bonding roller 100, and will not be described herein again.

As shown in fig. 1, the first applying roller 100 further includes a fixing shaft 140, the fixing shaft 140 is connected to the inner fixed roller 130, the inner fixed roller 130 is fixed to the fixing shaft 140, and the outer hollow roller 110 can rotate around the fixing shaft 140.

In an embodiment, as shown in fig. 1, the first attaching roller 100 further includes a bearing 150, the bearing 150 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 to rotate around the fixed shaft 140. The bearing 150 is, for example, a ball bearing.

In one embodiment, as shown in fig. 1, the bonding system 1 may include a coating apparatus 300, wherein the coating apparatus 300 is used for coating an ultraviolet curing adhesive 400 on a 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 in front of the first ultraviolet irradiation device 120 along a conveying direction D1.

In some embodiments, as shown in fig. 1, the bonding system 1 may further include a second coating device 310, and the coating device 310 may be used to coat an ultraviolet curing adhesive 410 on a third optical film 530.

Fig. 1A is a schematic view illustrating a bonding system according to another embodiment of the present disclosure, and fig. 1B is a schematic view illustrating a bonding system according to a further embodiment of the present disclosure. In this embodiment, the same or similar components as those in the previous embodiment are denoted by the same or similar component numbers, and the description of the same or similar components refers to the foregoing description, and thus, the description thereof is omitted.

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

In other embodiments, as shown in fig. 1B, in the bonding system 1B, the

coating devices

300 and 310 may be respectively disposed on two opposite surfaces of the second optical film 520 for coating the uv-curable adhesive 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 may pass between the first laminating roller 100 and the second laminating roller 200 together to form the laminated film 500 having a three-layer structure, and when laminating the first optical film 510, the second optical film 520, and the third optical film 530, the first ultraviolet irradiation device 120 may simultaneously provide a first ultraviolet light to irradiate the ultraviolet light curing type adhesive 400 between the first optical film 510 and the second optical film 520 and the ultraviolet light curing type adhesive 410 between the second optical film 520 and the third optical film 530 with the ultraviolet light, so as to partially cure the ultraviolet light curing

type adhesives

400 and 410. As described above, the flat surface formed after the lamination can be fixed by the partially cured uv

curable adhesives

400 and 410, and the formation of lines due to pulling or tension stretching during the backward conveyance after the lamination can be prevented, thereby preventing the generation of defects in the laminated film 500.

In some embodiments, the laminating device 10 can further include at least one pressing roller that contacts and provides a pressure to at least one of the first laminating roller 100 and the second laminating roller 200. As shown in fig. 1, in an embodiment, the laminating apparatus 10 may include two

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 may provide pressure to the corresponding contacting laminating roller, so as to achieve the effect of applying pressure 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, a roller having a hollow structure, and the first optical film 510, the second optical film 520, and/or the third optical film 530 are cooled by introducing a cooling gas or a cooling liquid into the hollow cavity inside the hollow structure.

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

FIG. 2A is a schematic cross-sectional view of a first laminating roller according to an embodiment of the present disclosure, FIG. 2B is a schematic cross-sectional view of the first laminating roller according to an embodiment of the present disclosure, FIG. 3A is a side view of an inner layer fixed roller according to an embodiment of the present disclosure, and FIG. 3B is a side view of an outer layer hollow roller according to an embodiment of the present disclosure, the side view being taken along the Y-Z plane. In this embodiment, the same or similar components as those in the previous embodiment are denoted by the same or similar component numbers, and the description of the same or similar components refers to the foregoing description, and thus, the description thereof is omitted. Note that in fig. 3A to 3B, only a part of the structural features is presented in a perspective manner and indicated by a broken line.

As shown in fig. 2A, in the embodiment, the groove 130r of the first applying roller 100A has an inward-concave arc surface, and the first ultraviolet irradiation device 120 can be fixed on the surface of the groove 130r through a fixing member (not shown). 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.

As shown in fig. 2A to 2B, the opening 130s has a length L1 along the axial direction of the first applying roller 100A, the length L1 is 1500 to 2500 millimeters (mm), the opening 130s has a width W1 along the axial direction perpendicular to the first applying roller 100A, and the width W1 is 10 to 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, so as to provide ultraviolet irradiation to a larger area of the laminated film 500 to achieve a more complete area of partial curing.

As shown in fig. 2B, the inner layer fixed roller 130 has at least one end portion 131 and a main body portion 132, the end portion 131 is connected to the main body portion 132, and an outer circumferential diameter d1 of the end portion 131 is smaller than an outer circumferential diameter d2 of the main body portion 132. In an embodiment, the bearing 150 may be disposed on the end portion 131 of the inner fixed roller 130, and the outer hollow roller 110 is connected to the bearing 150 and the main body portion 132 of the inner fixed roller 130. Therefore, the outer hollow roller 110 can rotate around the fixed shaft 140 by the driving of the bearing 150, and the inner fixed roller 130 can be fixed on the fixed shaft 140. In this way, the outer hollow roller 110 can rotate continuously to drive the optical film (e.g., the first optical film 510 in fig. 1) to move forward, and the groove 130r of the inner fixed roller 130 and the first ultraviolet irradiation device 120 can still maintain the same position and irradiate the first ultraviolet light on the optical film.

In some embodiments, as shown in fig. 2A-2B, the first bonding roller 100A further optionally includes a filter 160, the filter 160 is disposed at the opening 130s of the groove 130r, and the first ultraviolet light is emitted from the opening 130s through the filter 160. In an embodiment, the first bonding roller 100A further includes a fixing frame 170, and the optical filter 160 is fixed on the inner layer fixing roller 130 through 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 130 s. In some embodiments, as shown in fig. 2B, the filter 160 has a plurality of regions (three regions,

regions

160A, 160B, and 160C are shown in the present embodiment, but the disclosure is not limited thereto) along the length L1 of the opening 130s, and the light transmittance and/or the light transmittance wavelength range of the regions are different. For example, as shown in the embodiment of fig. 2B, the light transmittance of the area 160C is greater than that of the area 160B, and the light transmittance of the area 160B is greater than that of the area 160A, but the disclosure is not limited thereto. The number of the regions of the filter 160 and the relationship between the light transmittance of each region and/or the arrangement of the light transmission wavelength ranges can be adjusted and changed according to the actual requirement. By designing the filter 160, the light output of the first ultraviolet irradiation device 120 along the length L1 of the opening 130s, for example, the light output and/or the wavelength range of the transmitted light, can be adjusted.

The present disclosure further provides a method for manufacturing an optical film, which can be implemented by applying the above-mentioned bonding system.

According to some embodiments of the present disclosure, a method of manufacturing an optical film may include: providing a first optical film and a second optical film; coating an ultraviolet light curing type adhesive on the first optical film or the second optical film; and simultaneously laminating and providing a first ultraviolet light to the first optical film and the second optical film to form a laminated film.

A method for manufacturing an optical film according to an embodiment of the present disclosure is described below with reference to fig. 1. The embodiments are only used as examples and do not limit the scope of the present invention.

As shown in fig. 1, an ultraviolet curing adhesive 400 is coated on a first optical film 510 by a coating apparatus 300. In one embodiment, the coating device 310 can selectively coat an ultraviolet curing adhesive 410 on the third optical film 530. According to some other embodiments, referring to fig. 1A to 1B, the coating apparatus 300 may be used to coat the uv-curable adhesive 400 on the second optical film 520 at this stage, or the

coating apparatuses

300 and 310 may be used to coat the uv-

curable adhesive

400 and 410 on two opposite surfaces of the second optical film 520, respectively.

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 to between the first laminating roller 100 and the second laminating roller 200 for laminating to form a laminated film 500. In one embodiment, one of the

pressing rollers

800 and 810 may be selectively further used to contact and provide a pressure to at least one of the first bonding roller 100 and the second bonding roller 200, so as to perform the pressure bonding to improve the surface flatness of the optical film.

When the first optical film 510, the second optical film 520 and/or the third optical film 530 are bonded, the first ultraviolet light irradiation device 120 is used to provide a first ultraviolet light to irradiate the first optical film 510, the second optical film 520 and/or the third optical film 530. In one embodiment, the first UV light is irradiated for 0.01-0.05 seconds, and/or the energy intensity of the first UV light is 10-100 mJ/cm2, and/or the illumination intensity of the first UV light is 10-700 mW/cm 2.

After the irradiation with the first ultraviolet light, the ultraviolet light curing type 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 first ultraviolet light makes the curing and crosslinking reaction rate of the ultraviolet light curing adhesive equal to or less than 40%, preferably between 10 and 20%.

According to an embodiment of the present disclosure, the first uv light is only used to provide partial curing, and the uv-curable adhesive has a certain viscosity, which is beneficial for shaping the flat film surface, but because it is not completely cured, 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 in subsequent transportation or manufacturing processes.

Then, after the irradiation with the first ultraviolet light, a second ultraviolet light is provided to the laminated film 500. For example, in the embodiment, after the laminated film 500 is formed by the first optical film 510, the second optical film 520 and the third optical film 530, the laminated film may be transported to the second ultraviolet irradiation device 700 along the transportation direction D1, the second ultraviolet irradiation device 700 may provide an ultraviolet curing adhesive 400 and/or 410 in the laminated film 500, so that the ultraviolet curing adhesive 400 and/or 410 is completely cured, and the laminated film 500 with a completely set and flat surface is manufactured. In the embodiment, the distance between the second ultraviolet irradiation device 700 and the laminated film 500 is between 200 mm and 300 mm.

In one embodiment, the second UV light is irradiated for 1-2.5 seconds, and/or the energy intensity of the second UV light is 120-300 mJ/cm²) And/or the second ultraviolet light has an illuminance of, for example, 1000 to 4000 milliwatts per square centimeter (mw/cm)²)。

Specifically, since the irradiation of the ultraviolet light generates a high temperature, the irradiation time of the first ultraviolet light cannot be too long and/or the energy intensity cannot be too large, so as to prevent the

optical films

510, 520, and 530 from being damaged by the high temperature generated when the optical films are bonded. On the other hand, in order to completely cure the ultraviolet-curable adhesive, the second ultraviolet light irradiation time and/or the energy intensity must be maintained at a constant value.

Accordingly, in some embodiments, the irradiation time of the second ultraviolet light is longer than the irradiation time of the first ultraviolet light, and/or the energy intensity of the second ultraviolet light is longer than the energy intensity of the first ultraviolet light, and/or the illuminance of the second ultraviolet 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 the third optical film 530 by the partially cured ultraviolet light curable adhesive 400 and/or 410 during the pressure bonding, thereby preventing the texture from being formed on the second optical film 520 by the pulling or tension stretching during the backward conveying process, and simultaneously preventing the second optical film 520 from being damaged due to high temperature during the pressure bonding. And then, the uv curable adhesive 400 and/or 410 is completely cured by the second uv light to produce a completely shaped laminated film 500 having a flat surface.

In some embodiments, the laminated film 500 may be cooled simultaneously when the second uv light is provided, for example, by using the cooling roller 600 of fig. 1, so as to prevent the laminated film 500 from being damaged due to high temperature.

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

1. A fit system, comprising:

a laminating device, comprising:

a first bonding roller and a second bonding roller, disposed opposite to each other, for bonding a first optical film and a second optical film to form a laminated film, wherein the first bonding roller comprises:

a first ultraviolet light irradiation device for providing a first ultraviolet light;

an outer hollow roller; and

the inner layer fixing roller is arranged in the outer layer hollow roller and provided with a groove, an opening of the groove faces the laminated film, the first ultraviolet light irradiation device is arranged in the groove, the inner layer fixing roller is non-light-transmitting, and the first ultraviolet light is only emitted from the opening and irradiates the laminated film through the outer layer hollow roller.

2. The laminating system of claim 1, wherein the first laminating roller further comprises:

and the fixed shaft is connected with the inner layer fixed roller, wherein the inner layer fixed roller is fixed on the fixed shaft, and the outer layer hollow roller can rotate around the fixed shaft.

3. The laminating system of claim 1, wherein the first laminating roller further comprises:

and the bearing is connected with the inner layer fixed roller and the outer layer hollow roller, and is used for driving the outer layer hollow roller to rotate.

4. The laminating system of claim 3, wherein the inner fixed roller has at least one end portion and a main body portion, the end portion being coupled to the main body portion, an outer circumferential diameter of the end portion being smaller than an outer circumferential diameter of the main body portion, the bearing being disposed on the end portion, and the outer hollow roller being coupled to the bearing and the main body portion.

5. The fit system of claim 1, wherein the outer hollow roller train is transparent.

6. The laminating system of claim 1, wherein the groove has two side surfaces, the first ultraviolet irradiation device is sandwiched between the two side surfaces of the groove, and an included angle between the two side surfaces is 30-45 degrees; and/or the opening has a length along the axial direction of the first attaching roller, and the opening has a width along the axial direction perpendicular to the first attaching roller, wherein the length is 1500-2500 mm, and/or the width is 10-20 mm.

7. The fit system of claim 1, further comprising:

the second ultraviolet irradiation device is positioned at the downstream of the laminating device and used for providing second ultraviolet light for the laminated film; and/or

A cooling roller for cooling the laminated film.

8. The laminating system of claim 1, wherein the first laminating roller further comprises:

and the optical filter is arranged at the opening of the groove, wherein the optical filter is provided with a plurality of areas along the length direction of the opening, and the areas have different light transmittance and/or light transmittance wavelength ranges.

9. A method of manufacturing an optical film, comprising:

providing a first optical film and a second optical film;

coating an ultraviolet light curing type adhesive on the first optical film or the second optical film; and

the laminating system of claim 1, wherein the first optical film and the second optical film are simultaneously laminated and irradiated with a first ultraviolet light to form a laminated film.

10. The method of claim 9, wherein the first UV system provides a curing crosslinking reactivity of the UV-curable adhesive of 40% or less.

11. The method of claim 9, further comprising:

after the first ultraviolet light is provided to irradiate the first optical film and the second optical film, a second ultraviolet light is provided to irradiate the laminated film, wherein the first ultraviolet light enables the curing crosslinking reaction rate of the ultraviolet curing type adhesive to be equal to or less than 40%.

12. The method of claim 11, wherein the second UV light is irradiated for a time period longer than that of the first UV light, and/or the energy intensity of the second UV light is greater than that of the first UV light, and/or the illuminance of the second UV light is greater than that of the first UV light.

13. The method of claim 11, wherein the second UV light is irradiated for 1-2.5 seconds, and/or the energy intensity of the second UV light is 120-300 mJ/cm, and/or the illumination intensity of the second UV light is 1000-4000 mW/cm.

14. The method of claim 9, wherein the first UV light is irradiated for 0.01-0.05 seconds, and/or the first UV light has an energy intensity of 10-100 mJ/cm, and/or the first UV light has an illuminance of 10-700 mW/cm.