ROLL-TO-ROLL APPARATUS
According to an embodiment of the present disclosure, a roll-to-roll apparatus may include an unwinding unit, a winding unit, at least one supporting unit, at least one breakage sensor, and at least one holding unit. The at least one supporting unit is disposed between the unwinding unit and the winding unit, and supports the flexible substrate to move from the unwinding unit to the winding unit. The at least one breakage sensor may sense whether the flexible substrate is broken or not. The at least one holding unit may grip the flexible substrate while a breakage of the flexible substrate is sensed by the at least one breakage sensor.
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This application claims the priority benefits of a Taiwan application serial no. 105109606, filed on Mar. 28, 2016. The entirety of the above-mentioned patent application is hereby incorporated by reference herein.
TECHNICAL FIELDThe present disclosure relates to a roll-to-roll apparatus.
BACKGROUNDWhen a glass is thinner, it is bendy to foil ii a flexible glass. The flexible glass has characteristics of being bent and high hardness. It is applicable to a plane substrate of an electronic paper (e-paper), a protective cover of a photovoltaic module, a substrate of a touch sensor, a solid-state light-emitting element, an electronic device and so on.
Currently, transferring the flexible glass is in a roll-to-roll manner. Although the flexible glass with thin thickness has a considerable degree of flexibility, it retains the brittle property. Stress concentration of the strength may occur in the flexible glass due to surface defects or scratches. Therefore, any unstable delivery, drag, and/or torsion of the flexible glass may cause a breakage of the flexible glass. The current roll-to-roll equipment can transfers the flexible glass via a roll-to-roll process. When the breakage of the flexible glass occurred, even the drive roller stops rotating, the flexible glass continues to produce more unpredictable damages because of its flexibility and inertia effect. Therefore, it is hard to identify the initial broken position and the broken causes, and fail to prevent breakages recurring in the future.
SUMMARYIn an embodiment of the present disclosure, a roll-to-roll apparatus may comprise an unwinding unit, a winding unit, at least one supporting unit, at least one breakage sensor, and at least one holding unit. The at least one supporting unit is disposed between the unwinding unit and the winding unit, and supports a flexible substrate to move from the unwinding unit to the winding unit. The at least one breakage sensor senses whether the flexible substrate is broken or not. The at least one holding unit grips the flexible substrate while a breakage of the flexible substrate is sensed by the at least one breakage sensor.
The foregoing will become better understood from a careful reading of a detailed description provided herein below with appropriate reference to the accompanying drawings.
Below, exemplary embodiments will be described in detail with reference to accompanying drawings to be easily realized by a person having ordinary knowledge in the art. The inventive concept may be embodied in various forms without being limited to the exemplary embodiments set forth herein. Descriptions of well-known parts are omitted for clarity, and like reference numerals refer to like elements throughout.
In the embodiment, the roll-to-roll apparatus 100 has the at least one a holding unit 150. Once a breakage of the flexible substrate 50 is sensed by the at least one breakage sensor 140, not only the unwinding unit 110 and the winding unit 120 stop unwinding and winding, but also the flexible substrate 50 may be stopped and gripped by the at least one holding unit 150. That may prevent the flexible substrate 50 from falling, swinging, and/or expansion of damages, so that related manufacturing processes resume easily. Original breaking states of the flexible substrate 50 can be held as much as possible, to find out the broken causes, and to prevent breakages occurring in the flexible substrate 50 again in the future.
Other technical features described below embodies selectively in the present disclosure, but the present disclosure is not limited thereto. The technical features of various embodiments described under the situation without conflict are applicable to other embodiments.
In the present embodiment, there are a plurality of supporting units 130, a plurality of breakage sensors 140 and a plurality of holding units 150. In other embodiments. one or more of the numbers of these elements in the foregoing may be one. The unwinding unit 110 and the winding unit 120 are rollers. For example, the rolled flexible substrate 50 is free from the unwinding unit 110 and received by the winding unit 120. The at least one supporting unit 130 is a roller, for example, the at least one supporting unit 130 may rotate synchronously with the movement of the flexible substrate 50 to avoid generating a relative displacement between the surface of the supporting unit 130 and the flexible substrate 50. Thereby, the supporting unit 130 may scratch the flexible substrate 50 as less as possible. In an embodiment, the at least one holding units 150 may correspond to the at least one supporting units 130, respectively, and the flexible substrate 50 is held by both the at least one holding unit 150 and the at least one supporting unit 130, but the present disclosure is not limited thereto.
In addition, the roll-to-roll apparatus 100 of this embodiment may further include a processing unit 160 to perform various processes on the flexible substrate 50. For instance, the processing unit160 may perform sputtering, evaporation, or other suitable processes on the flexible substrate 50. In the embodiment, an exemplary material of the flexible substrate 50 includes glass, but the material of the flexible substrate 50 may include other flexible continuous sheet materials, such as metal, plastic, paper like, and so on. The thickness of the flexible glass substrate may be less than 150 μm, such as 100 μm or less. The width of the flexible glass substrate 50 may be greater than or equal to 100 mm, such as more than 200 mm. The length of the flexible glass substrate 50 may be greater than or equal to 1 m, such as more than 10 m. However, the dimensions of the flexible glass substrate 50 are not limited thereto.
In the embodiment, each breakage sensor 140 may be a tension sensor. The at least one breakage sensor 140 may be disposed on the at least one supporting unit 130. A portion of the tension of the flexible substrate 50 may be applied on the at least one supporting unit 130, and the at least one breakage sensor 140 may calculate a tension of the flexible substrate 50 according to sensed components of the tension. During a normal operation, the tension of the flexible substrate 50 should be within a non ial range. Once the at least one breakage sensor 140 senses the tension is beyond the normal range, it may be determined that a breakage occurs in the flexible substrate 50.
After the at least one breakage sensor 140 determines that the breakage occurs in the flexible substrate 50, the at least one holding unit 150 starts to grip the flexible substrate 50. The time that the roll-to-roll apparatus 100 activates the at least one holding unit 150 to grip the flexible substrate 50 may be less than the time that the flexible substrate 50 falls, so as to facilitate the gripping efficiency achieving. The way to activate the holding unit 150 may include, for example, solenoid valves with air pressure driven, magnetism driven, or motor driven. In the high-speed solenoid valve case, the response time of activation may be less than 15 ms. The supporting unit 130 of the roll-to-roll apparatus 100 may be a roller, for example, a roller-type supporting unit having a diameter of six inches is used to convey the flexible substrate 50 (for example, an ultra-thin glass substrate). A circumferential angle 0 (labeled in
In calculating the force for stopping the flexible substrate 50 in time, there are some forces to be calculated when a breakage occurs in the flexible substrate 50. For example, a gravity and a mobile inertia force of the flexible substrate 50 between two adjacent supporting units 130 generated by the weight of the flexible substrate are considered. For instance, assume that a distance between two adjacent supporting units 130 is 1 m, a width and a thickness of the flexible substrate 50 made of glass are 350 mm and 100 μm, respectively. Unser this scenario, the weight of the flexible substrate 50 between two adjacent the supporting unit 130 is about 86.1 g. The holding unit 150 may provide a frictional force about 0.84378 Newton to stop the flexible substrate 50. In above embodiment, the motion force after the breakage occurs in the flexible substrate 50 is not take into consideration yet. A material of the holding unit 150 may be such as plastic, rubber, silicone, or other materials having a hardness less than the hardness of the flexible substrate 50. It may avoid the flexible substrate 50 is scratched during the holding process. Alternatively, the coefficient of sliding friction between the holding unit 150 and the flexible substrate 50 may further be considered.
In addition, although the supporting unit 132 shown in
While the breakage sensor senses a breakage occurring in the flexible substrate, the roll-to-roll apparatus according to an embodiment of the present disclosure may drive the holding unit to grip the flexible substrate to prevent the flexible substrate from continuously moving forward or shaking. Original breaking states of the flexible substrate can be held as much as possible and expanded damages can be prevented, which facilitates the cause analysis for improvement and reduces the difficulty of cleaning breakages.
It will be clear that various modifications and variations may be made to the disclosed methods and materials. It is intended that the specification and examples be considered as exemplary only, with a true scope of the disclosure being indicated by the following claims and their equivalents.
Claims
1. A roll-to-roll apparatus, comprising:
- an unwinding unit;
- a winding unit;
- at least one supporting unit, disposed between the unwinding unit and the winding unit, and supporting a flexible substrate to move from the unwinding unit to the winding unit;
- at least one breakage sensor, sensing whether the flexible substrate is broken or not; and
- at least one holding unit, gripping the flexible substrate while a breakage of the flexible substrate is sensed by the at least one breakage sensor.
2. The roll-to-roll apparatus according to claim 1, wherein the at least one holding unit is arc-shaped and presses onto the flexible substrate on the at least one supporting unit while a breakage of the flexible substrate is sensed by the at least one breakage sensor.
3. The roll-to-roll apparatus according to claim 1, wherein when the at least one holding unit does not press onto the flexible substrate, a distance between the at least one holding unit and the flexible substrate is less than 100 μm.
4. The roll-to-roll apparatus according to claim 1, wherein two sides of the at least one supporting unit are higher than a middle portion of the at least one supporting unit, and a boundary of the flexible substrate is in contact with the at least one supporting unit.
5. The roll-to-roll apparatus according to claim 1, wherein the at least one holding unit grips a boundary of the flexible substrate.
6. The roll-to-roll apparatus according to claim 1, wherein the at least one holding unit is a roller and is in contact with the flexible substrate on the at least one supporting unit, and stops the flexible substrate in time while a breakage occurring in the flexible substrate is sensed by the at least one breakage sensor.
7. The roll-to-roll apparatus according to claim 1, wherein the at least one holding unit further comprises a first holding portion and a second holding portion, and grips the flexible substrate between the first holding portion and the second holding portion while a breakage occurring in the flexible substrate is sensed by the at least one breakage sensor.
8. The roll-to-roll apparatus according to claim 1, wherein the roll-to-roll apparatus comprises a plurality of holding units and a plurality of supporting units, and the plurality of holding units correspond to the plurality of supporting units, respectively, and the flexible substrate is held by both the plurality of holding units and the plurality of supporting units.
9. The roll-to-roll apparatus according to claim 1, wherein the at least one breakage sensor is a tension sensor, an image sensor, or an optical sensor.
10. The roll-to-roll apparatus according to claim 1, wherein a material of the flexible substrate is glass, metal, plastic, or paper like.
11. The roll-to-roll apparatus according to claim 1, wherein the roll-to-roll apparatus comprises a plurality of supporting units, and a frictional force between the at least one holding unit and the flexible substrate to grip the flexible substrate is greater than a gravity of the flexible substrate between two adjacent supporting units of the plurality of supporting units.
12. The roll-to-roll apparatus according to claim 1, wherein the at least one supporting unit is a roller, a circumferential angle of a portion of the at least one supporting unit in contact with the flexible substrate is in a range of 45° to 135°.
13. The roll-to-roll apparatus according to claim 1, wherein a width of the flexible substrate is L, the at least one supporting unit is a roller having a diameter is D, an area of the at least one holding unit in contact with the flexible substrate is A, and A≦L×π×D×3/8.
14. The roll-to-roll apparatus according to claim 1, wherein a material of the at least one holding unit is plastic, rubber, or silicone.
Type: Application
Filed: Sep 8, 2016
Publication Date: Sep 28, 2017
Applicant: Industrial Technology Research Institute (Hsinchu)
Inventors: Chao-Feng Sung (Hsinchu City), Yi-Shu Chen (Taichung City), Kuo-Hsin Huang (Hsinchu County), Hsin-Yun Hsu (Hsinchu County)
Application Number: 15/260,276