Rolling test device of flexible material

Abstract

The rolling test device for a flexible material according to the disclosed invention comprises a rolling unit including a winding roller that grips one side of a flexible material and a winding drive unit that rotates the winding roller in forward and reverse directions so that the flexible material is wound onto the winding roller or unwound from the winding roller, and a sliding unit spaced apart from the rolling unit that grips the other side of the flexible material and slides the flexible material according to the rotation of the winding roller. In particular, the sliding unit comprises a gripping block spaced apart from the winding roller that grips the other side of the flexible material, a slider formed protruding from both ends of the gripping block, a pair of sliding brackets spaced apart from the winding roller, and a sliding guide formed on the sliding brackets to guide the movement of the slider.

Description

Technology Field

[0001] The present invention relates to a rolling test device for a flexible material. In particular, the present invention relates to a rolling test device for a flexible material that prevents the flexible material from tilting between a sliding unit and a rolling unit when performing a rolling test on the flexible material, and ensures that the tensile force applied to the flexible material is consistent. Background Technology

[0003] Generally, LCD (Liquid Crystal Display), OLED (Organic Light Emitting Diodes), and EL (electroluminescence) are types of FPD (flat panel displays) that have low power consumption, lightweight and flat characteristics, so they are widely used in monitors such as televisions, computers, and mobile phones, as well as in automobiles and aircraft.

[0004] Recently, the industry has been actively developing flexible displays. As the performance and quality of these flexible displays improve, they must not only be able to bend but also possess the durability and operational stability to withstand bending beyond a certain degree. More precisely, the flexible display must be able to display normal images even when bent or rolled up, and conversely, when unfolded. As such, the degree to which a flexible display can bend within the range where it can display normal images—that is, its flexibility—is one of the important performance characteristics of a flexible display.

[0005] Recently, as the performance and quality of flexible displays have improved, active research and development related to displays is underway, including foldable display technology that allows the display to be fully folded or unfolded, slideable display technology that allows the display to be slid, and rollable display technology that allows the display to be rolled up like paper; furthermore, commercialization based on the results of this research and development is also actively taking place.

[0006] In particular, when conducting durability tests on rollable displays during the development process, the tensile force applied to the rollable display is one of the factors that most significantly affects the test results. Therefore, to obtain fair and consistent test evaluation results, the tensile force applied to the flexible material must be set consistently.

[0007] However, when conducting a rolling test of a flexible material, as the flexible material is wound onto the rolling unit, the diameter of the rolling unit increases, causing the flexible material to tilt. This presents a problem in that the tilt of the flexible material results in significant differences in the durability evaluation of the flexible material. Prior art literature

[0009] Korean Registered Patent Publication No. 10-2348742 (Published Jan. 07, 2022, Title of Invention: Rolling Device and Evaluation System for Durability Evaluation of Flexible Materials) The problem to be solved

[0010] The present invention was developed to solve the above-mentioned problems, and aims to provide a rolling test device for a flexible material that prevents the flexible material from tilting between the sliding unit and the rolling unit during a rolling test of the flexible material and ensures that the tensile force applied to the flexible material is consistent. means of solving the problem

[0012] A rolling test device for a flexible material according to a preferred embodiment of the disclosed invention comprises a rolling unit including a winding roller that grips one side of a flexible material and a winding drive unit that rotates the winding roller in forward and reverse directions so that the flexible material is wound onto the winding roller or unwound from the winding roller, and a sliding unit that grips the other side of the flexible material spaced apart from the rolling unit and slides the flexible material according to the rotation of the winding roller. The sliding unit comprises a gripping block that grips the other side of the flexible material spaced apart from the winding roller, a slider formed protruding from both ends of the gripping block, a pair of sliding brackets spaced apart from the winding roller so as to face each other, and a sliding guide formed on the sliding bracket and guiding the movement of the slider. The sliding guide alternately repeats a horizontal section in which the slider moves horizontally according to the rotation of the winding roller and an inclined section in which the slider moves at an angle.

[0013] Thus, when performing a rolling test on a flexible material, it is possible to prevent the flexible material from tilting between the sliding unit and the rolling unit and to ensure that the tensile force applied to the flexible material is consistent.

[0014] Here, the length of the horizontal section according to the number of rotations of the winding roller and the length of the inclined section according to the number of rotations of the winding roller are determined by the radius of the winding roller and the thickness of the flexible material.

[0015] Thus, the movement of the slider in the sliding guide can be clearly controlled according to the rotation speed of the winding roller.

[0016] Here, let n (where n is a natural number greater than or equal to 1) be the number of rotations of the winding roller, r be the radius of the winding roller, t be the thickness of the flexible material, y(n) be the length of the horizontal section according to the number of rotations of the winding roller, and X(n) be the length of the inclined section according to the number of rotations of the winding roller, then the following relationship is satisfied.

[0017]

[0018]

[0019]

[0020] Thus, the length of the horizontal section and the length of the inclined section can be clearly determined.

[0021] Here, the height of the inclined section according to the rotational speed of the winding roller matches the thickness of the flexible material.

[0022] Thus, the horizontal state of the flexible material between the winding roller and the gripping block can be stably maintained according to the rotation speed of the winding roller. Effects of the invention

[0024] According to a rolling test device for a flexible material according to a preferred embodiment of the present invention, when rolling a flexible material, it is possible to prevent the flexible material from tilting between a sliding unit and a rolling unit and to ensure that the tensile force applied to the flexible material is consistent.

[0025] Furthermore, the present invention can accurately guide the movement of the slider in the sliding guide according to the rotational speed of the winding roller. Additionally, the lengths of the horizontal section and the inclined section can be clearly defined. Moreover, the horizontal state of the flexible material between the winding roller and the gripping block can be stably maintained according to the rotational speed of the winding roller. Brief explanation of the drawing

[0027] FIG. 1 is a perspective view illustrating a rolling test device for a flexible material according to an embodiment of the present invention. FIG. 2 is a side view of FIG. 1. FIG. 3 is an enlarged view illustrating a sliding guide in a rolling test device for a flexible material according to an embodiment of the present invention. FIG. 4 is a drawing for explaining the process of the first winding of a flexible material onto a winding roller in a rolling test device for a flexible material according to an embodiment of the present invention. FIG. 5 is an enlarged view of section "A" in FIG. 4. FIG. 6 is a drawing for explaining the process of the second winding of a flexible material onto a winding roller in a rolling test device for a flexible material according to an embodiment of the present invention. FIG. 7 is an enlarged view of section "B" in FIG. 6. Specific details for implementing the invention

[0028] The above objects, other objects, features, and advantages of the present invention will be easily understood through the following preferred embodiments associated with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided to ensure that the disclosed content is thorough and complete, and to ensure that the spirit of the present invention is sufficiently conveyed to those skilled in the art.

[0029] In this specification, when a component is described as being on another component, it means that it may be formed directly on the other component or that a third component may be interposed between them. Additionally, in the drawings, the thicknesses of the components may be exaggerated for the effective explanation of the technical content.

[0030] Where terms such as "first," "second," etc. are used in this specification to describe components, these components shall not be limited by such terms. These terms are used merely to distinguish one component from another. The embodiments described and illustrated herein also include their complementary embodiments.

[0031] Furthermore, when it is stated that the first element (or component) operates or is executed on (ON) the second element (or component), it should be understood that the first element (or component) operates or is executed in the environment where the second element (or component) operates or is executed, or that the second element (or component) operates or is executed through direct or indirect interaction.

[0032] Where any element, component, device, or system is described as including a component consisting of a program or software, it should be understood, even without explicit mention, that element, component, device, or system includes hardware (e.g., memory, CPU, etc.) or other programs or software (e.g., an operating system or drivers required to run the hardware) necessary for the execution or operation of the program or software.

[0033] Furthermore, unless otherwise specified regarding the implementation of any element (or component), it should be understood that the element (or component) may be implemented in software, hardware, or any form of both software and hardware.

[0034] Furthermore, the terms used herein are for describing the embodiments and are not intended to limit the invention. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. As used in this specification, 'comprises' and / or 'comprising' do not exclude the presence or addition of one or more other components to the mentioned components.

[0035] Although an embodiment of the present invention has been described below, those skilled in the art may modify and change the present invention in various ways by adding, changing, deleting, or adding components, etc., without departing from the spirit of the present invention as described in the claims, and such modifications and changes are also to be included within the scope of the rights of the present invention.

[0037] Referring to FIGS. 1 to 7, a rolling test device for a flexible material (F) according to one embodiment of the present invention includes a rolling unit (20) and a sliding unit (30), and may further include a base unit (10).

[0038] In the base unit (10), the rolling unit (20) and the sliding unit (30) are combined at a distance from each other.

[0039] The rolling unit (20) grips one side of the flexible material (F) and causes the flexible material (F) to be wound or unwound.

[0040] The rolling unit (20) may include a winding roller (22) that grips one side of a flexible material (F), and a winding drive unit (23) that rotates the winding roller (22) in forward and reverse directions so that the flexible material (F) is wound onto the winding roller (22) or unwound from the winding roller (22). The rolling unit (20) may further include a rolling bracket (21) that is spaced apart from each other and coupled to a base unit (10), to which the rotation axis of the winding roller (22) is rotatably coupled.

[0041] The sliding unit (30) is spaced apart from the rolling unit (20) and grips the other side of the flexible material (F), and slides the flexible material (F) according to the rotation of the winding roller (22).

[0042] The sliding unit (30) may include a gripping block (33) that grips the other side of a flexible material (F) while spaced apart from the winding roller (22), a slider (34) formed protruding from both ends of the gripping block (33), a pair of sliding brackets (31) spaced apart from the winding roller (22) so as to face each other, and a sliding guide (32) formed on the sliding bracket (31) and guiding the movement of the slider (34) according to the rotation of the winding roller (22). The sliding bracket (31) is spaced apart from the rolling bracket (21) and coupled to the base unit (10). The sliding unit (30) may further include a sliding drive unit (35) that enables the gripping block (33) to be slidably coupled to the base unit (10).

[0043] Accordingly, when the winding drive unit (23) among the winding drive unit (23) and the sliding drive unit (35) is operated, the flexible material (F) is wound onto the winding roller (22), and when the sliding drive unit (35) among the winding drive unit (23) and the sliding drive unit (35) is operated, the flexible material (F) is unwound from the winding roller (22).

[0044] Here, the sliding guide (32) alternately repeats a horizontal section (321) in which the slider (34) moves horizontally according to the rotation of the winding roller (22) and an inclined section (322) in which the slider (34) moves at an angle.

[0045] In addition, the length of the horizontal section (321) and the length of the inclined section (322) according to the number of rotations of the winding roller (22) are determined by the radius of the winding roller (22) and the thickness of the flexible material (F).

[0046] Referring to FIGS. 3 to 5, when the number of rotations of the winding roller (22) is 1, the first rotation amount of the winding roller (22) is D (1), the length of the first horizontal section (321) is y (1), the horizontal distance of the first inclined section (322) is x (1), the length of the first inclined section (322) is X (1), and the height of the first inclined section (322) is h (1). Here, the radius of the winding roller (22) is r, and the thickness of the flexible material (F) is t.

[0047] Additionally, when the number of rotations of the winding roller (22) is 1, let C be the center of the winding roller (22), and let C1 (1) be the point where the inner surface (FI) of the flexible material (F) in a horizontal state meets the end portion of the flexible material (F) at the point where the first horizontal section (321) changes to the first inclined section (322), and let C2 (1) be the point where a virtual line extending vertically from the center of the winding roller (22) meets the inner surface (FI) of the flexible material (F) wound on the outermost side of the winding roller (22) at the point where the first horizontal section (321) changes to the second inclined section (322) spaced apart from C1 (1). Then, C, C1 (1), and C2 (1) form the vertices of a right triangle, the distance between C and C1 (1) is r+t, and the distance between C and C2 (1) is r. The distance between C1(1) and C2(1) is X(1), and the angle at point C is θ(1).

[0048] Then, the following relationship holds.

[0049] h(1) = t

[0050] D(1) = y(1) + x(1)

[0051]

[0052]

[0053] X(1) 2 = x(1) 2 + h(1) 2

[0054]

[0055] Accordingly, when the number of rotations of the winding roller (22) is 1, the height of the first inclined section (322) is t, and the first horizontal section (321) and the first inclined section (322) can be clearly designed.

[0056] Referring to FIGS. 3, 6, and 7, when the number of rotations of the winding roller (22) is 2, the second rotation amount of the winding roller (22) is D (2), the length of the second horizontal section (321) is y (2), the horizontal distance of the second inclined section (322) is x (2), the length of the second inclined section (322) is X (2), and the height of the second inclined section (322) is h (2). Here, the radius of the winding roller (22) is r, and the thickness of the flexible material (F) is t.

[0057] Additionally, when the number of rotations of the winding roller (22) is 2, let C be the center of the winding roller (22), and let C1 (2) be the point where the inner surface (FI) of the flexible material (F) in a horizontal state at one end of the flexible material (F) meets the outer surface (FO) of the flexible material (F) wound on the winding roller (22) at the point where the second horizontal section (321) changes to the second inclined section (322), and let C2 (2) be the point where a virtual line extending vertically from the center of the winding roller (22) meets the inner surface (FI) of the flexible material (F) wound on the outermost side of the winding roller (22) at the point where the second horizontal section (321) changes to the second inclined section (322) spaced apart from C1 (2). Then, C, C1 (2), and C2 (2) form the vertices of a right triangle, and C and The distance between C1(2) is r+2t, the distance between C and C2(2) is r+t, the distance between C1(2) and C2(2) is X(2), and the angle at point C is θ(2).

[0058] h(2) = t

[0059] D(2) = y(2) + x(2)

[0060]

[0061]

[0062] X(2) 2 = x(2) 2 + h(2) 2

[0063]

[0064] Accordingly, when the number of rotations of the winding roller (22) is 2, the height of the second inclined section (322) is t, and the second horizontal section (321) and the second inclined section (322) can be clearly designed.

[0065] In summary, if the number of rotations of the winding roller (22) is denoted as n (where n is a natural number greater than or equal to 1), the length of the horizontal section (321) according to the number of rotations of the winding roller (22) is denoted as y(n), and the length of the inclined section (322) according to the number of rotations of the winding roller (22) is denoted as X(n), then the following relationship is satisfied.

[0066] h(n) = t

[0067] D(n) = y(n) + x(n)

[0068]

[0069]

[0070] X(n) 2 = x(n) 2 + h(n) 2

[0071]

[0072] Accordingly, when the number of rotations of the winding roller (22) is n, the height of the inclined section (322) according to the number of rotations of the winding roller (22) is constant at t, which is the thickness of the flexible material (F), and the nth horizontal section (321) and the nth inclined section (322) can be clearly designed.

[0073] According to the rolling test device for the flexible material (F) described above, when rolling the flexible material (F), the flexible material (F) is prevented from tilting between the sliding unit (30) and the rolling unit (20), and the tensile force applied to the flexible material (F) can be made consistent.

[0074] In addition, the movement of the slider (34) in the sliding guide (32) can be accurately guided according to the number of rotations of the winding roller (22). In addition, the length of the horizontal section (321) and the length of the inclined section (322) can be clearly defined. Furthermore, the horizontal state of the flexible material (F) between the winding roller (22) and the gripping block (33) can be stably maintained according to the number of rotations of the winding roller (22).

[0075] delete Explanation of the symbols

[0076] F: Flexible material FO: Outer surface FI: Inner surface 10: Base unit 20: Rolling unit 21: Rolling bracket 22: Winding roller 23: Winding drive unit 30: Sliding unit 31: Sliding bracket 32: Sliding guide 321: Horizontal section 322: Inclined section 33: Grip block 34: Slider 35: Sliding drive unit y(1): Length of the first horizontal section y(2): Length of the second horizontal section x(1): Horizontal distance of the first inclined section x(2): Horizontal distance of the second inclined section X(1): Length of the first inclined section X(2): Length of the second inclined section h(1): Height of the first inclined section h(2): Height of the second inclined section D(1): Horizontal travel distance of the slider due to the first rotation D(2): Horizontal travel distance of the slider due to the second rotation r: Radius of the winding roller t: Thickness of the flexible material

Claims

Claim 1 A rolling test device for a flexible material, comprising: a rolling unit including a winding roller that grips one side of a flexible material and a winding drive unit that rotates the winding roller in forward and reverse directions so that the flexible material is wound onto the winding roller or the flexible material is unwound from the winding roller; and a sliding unit that grips the other side of the flexible material spaced apart from the rolling unit and slides the flexible material according to the rotation of the winding roller; wherein the sliding unit comprises: a gripping block that grips the other side of the flexible material spaced apart from the winding roller; a slider formed protruding from both ends of the gripping block; a pair of sliding brackets installed spaced apart from the winding roller; and a sliding guide formed on the sliding brackets and guiding the movement of the slider; wherein the sliding guide is characterized by alternately repeating a horizontal section in which the slider moves horizontally according to the rotation of the winding roller and an inclined section in which the slider moves at an angle. Claim 2 A rolling test device for a flexible material according to claim 1, wherein the length of the horizontal section according to the number of rotations of the winding roller and the length of the inclined section according to the number of rotations of the winding roller are determined by the radius of the winding roller and the thickness of the flexible material. Claim 3 In paragraph 2, if the rotational speed of the winding roller is denoted as n (where n is a natural number greater than or equal to 1), the radius of the winding roller is denoted as r, the thickness of the flexible material is denoted as t, the length of the horizontal section according to the rotational speed of the winding roller is denoted as y(n), and the length of the inclined section according to the rotational speed of the winding roller is denoted as X(n), then A rolling test device for a flexible material characterized by satisfying the relationship equation. Claim 4 A rolling test device for a flexible material, characterized in that, in any one of claims 1 to 3, the height of the inclined section according to the rotational speed of the winding roller matches the thickness of the flexible material.

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