45.2: Two Point Bending of Thin Glass Substrate

Gulati, Suresh T.; Westbrook, Jamie T.; Carley, Stephen H.; Vepakomma, Hemanth; Ono, Toshihiko

doi:10.1889/1.3621406

Cited by 32 publications

(16 citation statements)

References 3 publications

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“…As the flexible glass becomes both thinner and higher strength, mechanical test methods designed for rigid-sheet substrates are no longer valid. Improved strength test methods designed specifically for flexible glass were developed, including 2-point bend [3] and bi-axial flexure testing. [4] More information on strength test methods appropriate for flexible glass will be provided.…”

Section: Resultsmentioning

confidence: 99%

26.1: Invited Paper: Ultra‐Slim Flexible Glass Substrates for Display Applications

Garner

Merz

Glaesemann

et al. 2012

Symp Digest of Tech Papers

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Section: Resultsmentioning

confidence: 99%

26.1: Invited Paper: Ultra‐Slim Flexible Glass Substrates for Display Applications

Garner

Merz

Glaesemann

et al. 2012

Symp Digest of Tech Papers

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“…< 10mm. As the surface of ultrathin glass touches the surface of the pushing plates, the bending strength can be calculated with the following simplified equation [5],…”

Section: High Strength After Chemical Tougheningmentioning

confidence: 99%

17‐3: Towards Flexible Glass: Ultra‐Thin Glass with Tight Dimensional Tolerance and High Strength Achieved by Ion Exchange

He¹,

Jotz

Wegener

et al. 2017

Symp Digest of Tech Papers

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Ultrathin aluminosilicate glass AS 87 eco, has been produced by SCHOTT proprietary downdraw hot-forming method as thin as 50 μm. A tight thickness tolerance of ± 10um, with a TTV <10 um across an area of 400×500mm, and a surface roughness smaller than 1 nm have been achieved in mass production. Compared with other ultrathin glass, the uniqueness of AS 87 eco lies in its the outstanding chemical strengthening performance, where the surface compressive stress can reach over 800 MPa after an ion-exchange process in molten KNO3 salt bath. The high alumina content also accelerates the Na-K diffusion, and an ion exchange depth of 20 μm can be achieved after toughening at 390C for 2h. Combining such chemical strengthening with fine edge treatment results in an extremely high bending strength over 1GPa, allowing a safe bending radius as low as 3mm for 70 μm thick glass. As such, this ultrathin glass enables a highly scratch-resistant glass cover for applications such as foldable displays and any other applications requiring the combined properties of strength, transparency, flexibility, and scratch-resistance properties. Low breakage strength is the most significant obstacle for a wide application of ultrathin glass, and aluminosilicate glass can be strengthened well after ion exchange. SCHOTT is the first supplier in mass production of directly hot-formed ultrathin aluminosilicate glass eliminating the need for chemical thinning.

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“…The bar attached to one edge of the PDLC films was moved at 10 cm/s. The radius of curvature of the bending deformations may vary across the PDLC films [36], The bending stress applied to the PDLC films can be described as follows [37],…”

Section: (D)mentioning

confidence: 99%

Enhanced Adhesion and Transmittance Uniformity in Laminated Polymer-Dispersed Liquid Crystal Films

Yoo¹,

Park²,

Park³

2014

Journal of the Optical Society of Korea

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We propose a two-step UV irradiation procedure to fabricate polymer-dispersed liquid crystal (PDLC) films by lamination. During the first UV treatment, before lamination, the UV-curable monomers coated on one film substrate are solidified through photo-polymerization as the phase separation between the liquid crystals and the monomers. Introducing an adhesion-enhancement layer on the other plastic substrate and controlling the UV irradiation conditions ensure that UV-induced cross-linkable functional groups remain on the surfaces of the photo-polymerized layers. Thereby, the adhesion stability between the top and bottom films is much improved during a second (post-lamination) UV treatment by further UV-induced cross-linking at the interface. Because the adhesion-enhancement and PDLC layers prepared by the bar-coating process are solidified before lamination, the PDLC droplet distribution and the cell gap between the two plastic substrates remain uniform under the lamination pressure. This ensures that the voltage-controlled light transmittance is uniform across the entire sample.

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45.2: Two Point Bending of Thin Glass Substrate

Cited by 32 publications

References 3 publications

26.1: Invited Paper: Ultra‐Slim Flexible Glass Substrates for Display Applications

26.1: Invited Paper: Ultra‐Slim Flexible Glass Substrates for Display Applications

17‐3: Towards Flexible Glass: Ultra‐Thin Glass with Tight Dimensional Tolerance and High Strength Achieved by Ion Exchange

Enhanced Adhesion and Transmittance Uniformity in Laminated Polymer-Dispersed Liquid Crystal Films

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