CN101542264A - Method and apparatus for proof testing a sheet of brittle material - Google Patents
Method and apparatus for proof testing a sheet of brittle material Download PDFInfo
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- CN101542264A CN101542264A CNA2007800434418A CN200780043441A CN101542264A CN 101542264 A CN101542264 A CN 101542264A CN A2007800434418 A CNA2007800434418 A CN A2007800434418A CN 200780043441 A CN200780043441 A CN 200780043441A CN 101542264 A CN101542264 A CN 101542264A
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Abstract
Disclosed is a method of proof testing a sheet of brittle material such as a glass or glass-ceramic based material. The method comprises bending the glass sheet over at least one arcuate member to detect sheets having a strength greater than a predetermined value. The method includes imparting a bend to the sheet and producing relative motion between the sheet and the bend such that the bend traverses the sheet, and wherein tensile stress induced in a surface of the sheet by the bend corresponds to the predetermined strength value. An apparatus for performing the proof testing is also disclosed.
Description
The application requires the U.S. Provisional Application S/N.60/849 that submitted on October 4th, 2006,298 right of priority according to 35 U.S.C. § 119 (e).
Background of invention
Invention field
The present invention relates to be used for the method and apparatus of demonstration test hard brittle material, relate in particular to demonstration test glass or glass ceramic board.
Description of related art
In commercial product, utilize the display device of plasma, liquid crystal or Organic Light Emitting Diode display element etc. defeating the cathode ray tube (CRT) display rapidly, thereby in all application from the cell phone to the TV, obtain to use.Yet the introducing of flexible display as thin as a wafer only is in its initial stage.This major part is owing to place due to the huge topology requirement on this type of display device: they must withstand the deflection of repetition or crooked and do not damage equipment or the substrate that it placed; Because the expection of flexible display in portable set used, they are supposed to withstand rough operation, and can exceedingly not damage equipment or substrate; And they should withstand can be less than 2 centimetres and in some cases less than 1 centimetre bending radius.
A kind of material that is used for flexible display by expection is a glass.Glass is chemical-resistant, transparent normally, can form airtight barrier or sealing, and can be formed plate as thin as a wafer.Produced and customary used thickness less than 1 millimeter even less than 0.7 millimeter 10 square metres the plate that surpasses, and expect that soon glass plate reaches the size at least about 100 square metres.In typical display production, use one or more big glass plates or substrate to form a plurality of displays.Usually by scribing and section these displays are divided into individual display units subsequently.Thereby, by producing display unit as much as possible great glass plate is utilized effectively.
Glass-cutting is glass plate in this embodiment, forms defective (for example, crack) at the edge of glass plate usually.These defectives can be used as fracture origin, thereby reduce the intensity of plate, if glass is made defective stand drawing stress by deflection then is especially true.Usually, typical display device and without undergoing significant deflection, thereby the existence of these defectives relation is little.
In manufacture process or between the operating period, flexible display produces sizable stress in display base plate just because of its flexible character.Thereby the defective that may appear in the glass may stand enough big stress and make glass breakage.Because typical display manufacturing relates to glass-cutting forming individual displays, and known cutting meeting produces a plurality of defectives along cutting edge in glass, so this is indicating under an eclipse based on the flexible display device of glass substrate.
Reduce the glass plate edge place defective attempt comprise cut, grinding, polishing etc., all these is attempted to remove or minimizedly is cut into the defective that is produced should size be arranged the time when glass plate.Yet, wherein the many methods in these methods are also unsatisfactory for flexible display application, this is because this technology can not be removed little defective to expection stress required size, or because this technology is difficult to be applied to thin like this glass plate (thickness is less than about 0.4 millimeter).Can use acid etching, but this can make also the display device that is arranged on the substrate degenerate to glass edge.Thereby, so no matter adopting which kind of cutting method, defective will continue in glass plate especially to form in the edge of plate.
Brief summary of the invention
In one embodiment of the invention, a kind of method of demonstration test sheet of brittle material is disclosed, this method comprises: apply bending and between plate and bending, produce relative motion to this plate and make crooked this plate of traversal, and wherein by bending in the surface of plate caused drawing stress corresponding to the predetermined strength value with the detected intensity plate bigger than this predetermined strength value.
In another embodiment, a kind of method of demonstration test glass plate has been described, this method comprises: glass plate is produced and the corresponding drawing stress of predetermined strength value in crooked this plate and the surface at this plate crooked at least one roller, and produce relative motion make the further part of plate suffer drawing stress with the detected intensity plate bigger than predetermined strength value between plate and at least one roller.
In another embodiment, a kind of device of demonstration test sheet of brittle material is disclosed, this device comprises: be used for contacting this plate and cause at least one crooked arc component at sheet of brittle material, wherein the radius-of-curvature of this at least one arc component be chosen to make by bending in the surface of plate caused drawing stress corresponding to the predetermined strength value with the detected intensity plate bigger than this predetermined strength value.
Be appreciated that above general description and following detailed description only are to exemplary illustration of the present invention, and they aim to provide the general survey or the framework of the essence and the characteristic that are used to understand the present invention for required protection.
Included accompanying drawing is used to provide to further understanding of the present invention, and is incorporated in this instructions and constitutes its part.These accompanying drawings might not be drawn in proportion, and for the sake of clarity big I distortion of each element.Accompanying drawing illustrates one or more embodiment of the present invention, and describes one with this and be used from explanation principle of the present invention and operation.
The accompanying drawing summary
Fig. 1 is the curve map of the stretching in MPa " demonstration test " stress that applies of the function in the radius-of-curvature of cm as arc component (for example roller), and wherein the glass plate of three kinds of thickness is bent on this arc component.
Fig. 2 is the side view according to the device that is used for the demonstration test sheet of brittle material of the embodiment of the invention that utilizes single roller or lining.
Fig. 3 is the side view according to the device that is used for the demonstration test sheet of brittle material of the embodiment of the invention that utilizes single non-circular arc component.
Fig. 4 is the curve map that illustrates as " safety " stress function, that can be applied to the glass plate that has been verified test according to the present invention of the bending radius of using in demonstration test.
Fig. 5 is used for the another embodiment of the present invention of crooked sheet of brittle material in different directions with two arc components.
Fig. 6 is used for three arc components crooked in different directions sheet of brittle material and makes this plate return the another embodiment of the present invention of inletpiston.
Fig. 7 utilizes the arc component that only contacts the edge of this plate in a side of sheet of brittle material, and the another embodiment of the present invention that contacts the arc component of this plate at opposite side across the whole width of this plate.
Fig. 8 is an another embodiment of the present invention of utilizing the arc component at the edge that only contacts sheet of brittle material.
Describe in detail
Glass intensity is indicated by the appearance of defective in glass.If drawing stress is applied to the glass with defective, then stress becomes concentrated at fault location.Defective can be a micro crack for example, and stress concentrates on the tip in crack in this case.If stress surpasses a certain size, genetic defects-crack-may grow then.If apply enough stress, then in fact crack growth can be moment, thereby causes the catastrophic failure of glass: glass breakage.
Similar based on the intensity of the most weak ring with the intensity of chain, therefore the intensity that glass intensity can be characterized as being greatest drawback also be the intensity of weak defective.For example, if apply the drawing stress of 10kpsi to glass fibre, and this fiber keeps firm, we can say that then the intensity of this fiber is at least 10kpsi.That is, whole defectives that may be present on this glass fibre all can cause that than 10kpsi the defective of destruction is little.Like this, because of causing the required minimum stretch stress of catastrophic failure, the defective in the glass represents " size " of this defective by explanation usually.Thereby, we can say the stress that is subjected to 10kpsi and uncracked glass fibre not than the defective of 10kpsi " greatly ".Although choose words inappropriately a little, in the strength of glass field, generally adopt stress to characterize defect size.
As recognizing from aforementioned discussion, strength of glass is the historical results of glass.That is, the new glass that forms is especially firm inherently.Draw the intensity that (as-drawn) glass plate can reach the glass fibre of new formation, surpass 700Mpa usually.Yet, subsequent treatment or be exposed to environmental factor and can produce defective, or enlarge existing defective, thus make the glass reduction.For this reason, for example new optical fiber that draws by coat polymers coating immediately with the cover glass surface and prevent or minimize at least the degeneration of intensity.
Glass plate is cut into usually should size.For example, in the melten glass board manufacturing process, the glass flows of fusion is crossed the inclination profiled surface on the both sides of wedge shape formed body.These two glass flows of separating are converged at the bottom or the root of formed body, and the profiled surface that wherein tilts is joined herein and had the glass tape of initial surface with generation.Usually by mechanical scribing this band is cut into the plate of predetermined length subsequently.After a while, also the side of this plate is removed by similar mechanical scribing processes.Thereby the edge of plate suffers to damage the power at this edge.For example, this damage can comprise the edge of chipization or cracking plate, thereby causes intensity to reduce.The present invention by the test glass plate with in the check-out console especially the defective that surpasses minimum dimension of the edge of plate have this problem that solves.
As mentioned above, hard brittle material (for example glass) is subjected to tensile force and breaks.A kind of method that produces tensile force in glass is a curved glass.For given bending radius, caused stress is determined according to following equation:
Wherein t is that the thickness and the R of plate are bending radius, E
0The zero stress Young modulus and the α that are material are the linear dependence of Young modulus to the strain that some hard brittle materials stood.Fig. 1 illustrates the proof stress as calculated of Corning (healthy and free from worry) code 1737 glass plates, wherein E
0Be about 70.9GPa.Parameter alpha is selected at pure silicon dioxide, because α the unknown of code 1737 glass.Yet in fact, α only has 3% effect (100kpsi) to 1% strain, thereby it can be ignored for simplicity and excessive error can not take place.The thickness of plate is 200 μ m (curve 10), 400 μ m (curve 12) and 700 μ m (curve 14).
According to embodiments of the invention, a kind of method of demonstration test sheet of brittle material has been described.Sheet of brittle material comprises glass or glass ceramics the most at large, but can comprise other hard brittle material that can be formed flexible board.With reference to figure 2, in its simple embodiment, the present invention can be by representing applying on the arc component 18 that crooked radius-of-curvature is R crooked sheet of brittle material 16 to plate.As shown in Figure 2, arc component 18 can be the roller of rotatably installing, but can also be the lining of fixing (for example irrotational), perhaps as shown in Figure 3, can be to have by the low material of friction factor (for example, such as DuPont
And so on fluoropolymer resin) simple shape of the curved surfaces that forms.Plate 16 can move on arc component 18 and make the plate 16 of predetermined length sequentially stand the bending radius of being forced.Predetermined length can be the whole length or the sub-length of plate.Perhaps, arc component can move on plate 16 and arc component is maintained fixed.
The radius of curvature R of arc component is selected such that it is such as according to above equation 1 required stress being imposed on plate.That is, the radius-of-curvature of required stress level and then the required minimum strength arc component that can be bent by its upper plate is determined.Fig. 4 is depicted in the demonstration test plate providing subsequently " safety " bending radius for radius-of-curvature essential between the follow-up operating period, for example during instantaneous case of bending (curve 20); During the long period bending (bending-curves 22 of a few hours); And the case of bending that lasts for several years (for example, greater than 5 years-curve 24).For example, referring to Fig. 4,, then need the demonstration test bending radius (radius-of-curvature of arc component) of 50cm to guarantee that term of life was longer than 5 years if plate comprises the lasting bending radius of 100cm.If with the rolling so that long-time storage of plate then may run into this type of situation.
As should be conspicuous, use single arc component must need to change the direction (supposing that plate moves on arc component) of plate according to above description.May the more important thing is that the embodiment of Fig. 2 and Fig. 3 produces the drawing stress on the single face that only is applied to plate 16.That is, only bending makes the face opposite with arc component be subjected to tensile force on single direction, and the face that contacts with arc component is compressed power.For the opposing face that makes plate 16 suffers and first identical drawing stress, be necessary the plate of mobile this length of continuation on arc component with the plate upset and the second time.
Figure 5 illustrates more effective embodiment of the present invention, wherein two arc components contact with plate 16.Contact plate 16 on each comfortable face opposite of these two arc component 18a and 18b with another arc component.That is, arc component replaces each face when contact plate.Plate 16 (for example clockwise direction) in one direction is crooked on the first arc component 18a of R1 in radius-of-curvature, and (for example counterclockwise) has second curvature radius R on the second direction different with first direction subsequently
2The second arc component 18b go up crooked.Thereby first 26 of plate 16 suffers drawing stress, and second 28 suffers drawing stress subsequently, thus only need plate 16 between arc component by once drawing stress being applied to the two sides of plate.Edge in order to ensure fender after demonstration test makes it to avoid mechanical damage, and available protective coating applies these edges.For example, usable polymers coating application edge.In certain embodiments, can apply the one or both sides of whole plate.
Should it is evident that, also can use additional rollers.For example, if expectation is moved to plate the same plane 29 at this plate place when entering arc component between arc component, then can increase radius-of-curvature is R
3The 3rd arc component 18c, as shown in Figure 6.For example, can force these conditions according to the physical space factor.R
1, R
2And R
3(identical) of Xiang Denging preferably, but if desired also can be different.
The foregoing description adopts the arc component of the whole width of crossing over plate.In certain embodiments, it may be undesirable contacting whole width.For example, the glass plate that uses when making flat-panel monitor must satisfy strict surface quality requirement.Available or " high-quality " zone of contact plate can make the disabled surface imperfection of plate.Usually, quality area is defined in the medial region in any zone that is contacted during the processing.Therefore, the scalable arc component makes arc component at least one side of plate and near the external margin of the plate neighboring area of contact plate only.Fig. 7 shows this configuration, and glass plate shown in it 16 passes through between the overall with roller 32 on edge rollers on the side 30 and the opposition side.Plate 16 moves on the direction indicated by the direction arrow among the figure.At least the surface quality on the one side of this arrangement holding plate.If should be minimized with the contacting of two sides of plate, then the edge rollers both sides that are used in plate contact this plate in the periphery office of plate and not in the quality area of arbitrary side contact plane.Fig. 8 and situation shown in Figure 7 are similar, but Fig. 8 describes two sides of edge rollers 30 contact plates 16, and not in the either side contact center of plate quality area 32.
If the strength ratio of defective is little by the drawing stress that crooked this plate is applied, then plate may rupture.In certain embodiments, if especially glass is not coated, then fracture is self-evident: plate is broken into two or more independent sheets.In other embodiments, can utilize such as polymer film and on the one or both sides of plate, apply.In this case, especially in the automated manufacturing process, may not can detect fracture immediately.Thereby audio-frequency detection can be used for detection of broken effectively.For example, can cause feed plate 16 between the roller 32 in bending on the supply line, and sonic transducer 34 is being placed on the near surface of plate.The sound that fracture produces in the plate is detected by sonic transducer.Sonic transducer is electrically coupled to opertaing device 38 (for example computing machine 38) by control line 36, and wherein for example scalable opertaing device 38 stops the motion of plate between roller.Also can comprise other control function, can listen and/or visible alarm such as activating.
Providing under the situation of advantage of the present disclosure, it will be apparent for a person skilled in the art that various roller configuration described herein can be installed on the fixed frame, wherein sheet of brittle material moves with respect to roller and makes the further part of plate be subjected to strength test.Perhaps, can install on the hand-held framework that little roller is portable to produce, the strength-testing machine of hand-held.Subsequently the edge of the sheet of brittle material that will test be placed between the roller of hand-held strength-testing machine and the operator who holds testing machine with respect to this this testing machine of plate translation, thereby with respect to the intensity at an edge of predetermined strength value primary test board.
Although described the present invention in conjunction with concrete exemplary embodiment of the present invention, obviously, those skilled in the art will recognize that a lot of replacements, modification and modification according to above description.Therefore, the present invention is intended to contain the spirit that falls into appended claims and all these replacements, modification and the modification within the broad range.
Claims (20)
1. the method for a demonstration test sheet of brittle material, it comprises: apply bending and produce relative motion between described plate and described bending to described plate and make described plate of described crooked traversal and the corresponding plate that has the intensity bigger than described predetermined strength value with detection with the predetermined strength value of drawing stress that is wherein caused in the surface of described plate by described bending.
2. the method for claim 1 is characterized in that, applies described bending and is included in crooked described plate on the arc component.
3. the method for claim 1 is characterized in that, also is included on a plurality of arc components crooked described plate to apply a plurality of bendings, and described a plurality of arc components are the described plate of contact on the alternately face of described plate.
4. method as claimed in claim 2 is characterized in that described arc component is a roller.
5. method as claimed in claim 3 is characterized in that, described a plurality of arc components comprise a plurality of rollers.
6. method as claimed in claim 2 is characterized in that described arc component does not contact the core of described plate.
7. method as claimed in claim 2 is characterized in that, the whole width that described arc component is crossed over described plate extends.
8. the method for claim 1 is characterized in that, described sheet of brittle material comprises glass or glass ceramics.
9. the method for claim 1 is characterized in that, breaking in the described plate utilizes sonic transducer to detect.
10. the method for claim 1 is characterized in that, the radius-of-curvature of described arc component is less than about 20cm.
11. the method for claim 1 is characterized in that, described plate utilizes the polymeric layer coating.
12. the method for a demonstration test glass plate, it is included in crooked described glass plate at least one roller so that described plate is crooked and produce and the corresponding drawing stress of predetermined strength value in the surface of described plate, and between described plate and described at least one roller, produce relative motion make the further part of described plate suffer described drawing stress with detected intensity than the big plate of described predetermined strength value.
13. method as claimed in claim 12 is characterized in that, the thickness of described glass plate is less than about 0.4mm.
14. method as claimed in claim 12 is characterized in that, described drawing stress is at least about 50MPa.
15. method as claimed in claim 12 is characterized in that, described at least one roller comprises alternately a plurality of rollers of face of the described glass plate of contact.
16. device that is used for the demonstration test sheet of brittle material, it comprises and is used for contacting described plate and causes at least one crooked arc component at described sheet of brittle material, and the radius-of-curvature of wherein said at least one arc component is selected as making that the drawing stress that is caused by described bending is corresponding with the predetermined strength value with the detected intensity plate bigger than described predetermined value in the surface of described plate.
17. device as claimed in claim 16 is characterized in that, described arc component is a roller.
18. device as claimed in claim 16 is characterized in that, described at least one arc component comprises a plurality of arc components.
19. device as claimed in claim 18 is characterized in that, described a plurality of arc components are a plurality of rollers.
20. device as claimed in claim 18 is characterized in that, described a plurality of arc components do not contact the core of described plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210027724.6A CN102607962B (en) | 2006-10-04 | 2007-10-02 | For the method and apparatus of demonstration test sheet of brittle material |
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US84929806P | 2006-10-04 | 2006-10-04 | |
| US60/849,298 | 2006-10-04 | ||
| US11/888,202 US7461564B2 (en) | 2006-10-04 | 2007-07-31 | Method and apparatus for proof testing a sheet of brittle material |
| US11/888,202 | 2007-07-31 | ||
| PCT/US2007/021159 WO2008045241A2 (en) | 2006-10-04 | 2007-10-02 | Method and apparatus for proof testing a sheet of brittle material |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210027724.6A Division CN102607962B (en) | 2006-10-04 | 2007-10-02 | For the method and apparatus of demonstration test sheet of brittle material |
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| Publication Number | Publication Date |
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| CN101542264A true CN101542264A (en) | 2009-09-23 |
| CN101542264B CN101542264B (en) | 2012-03-14 |
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| CN2007800434418A Active CN101542264B (en) | 2006-10-04 | 2007-10-02 | Method and apparatus for proof testing a sheet of brittle material |
| CN200780041769.6A Expired - Fee Related CN101535039B (en) | 2006-10-04 | 2007-10-02 | Electronic device and method of making |
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| CN200780041769.6A Expired - Fee Related CN101535039B (en) | 2006-10-04 | 2007-10-02 | Electronic device and method of making |
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| TW (1) | TWI358537B (en) |
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| CN103424311A (en) * | 2012-05-17 | 2013-12-04 | 旭硝子株式会社 | Method and device for endurance test of fragile plate |
| CN103512810A (en) * | 2012-06-18 | 2014-01-15 | 旭硝子株式会社 | Durability testing method for brittle sheet and durability testing device for brittle sheet |
| CN104101544A (en) * | 2013-04-11 | 2014-10-15 | 三星显示有限公司 | Bending apparatus and bending method using the same |
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| CN110023735A (en) * | 2017-09-07 | 2019-07-16 | 株式会社Lg化学 | For assessing the brittle device and method of electrode |
| US11060961B2 (en) | 2017-09-07 | 2021-07-13 | Lg Chem, Ltd. | Apparatus and method for evaluating electrode embrittlement |
| CN110023735B (en) * | 2017-09-07 | 2021-09-14 | 株式会社Lg化学 | Apparatus and method for assessing brittleness of an electrode |
| CN112823274A (en) * | 2018-08-14 | 2021-05-18 | 康宁股份有限公司 | Method and apparatus for determining crush strength of an edge |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101535039A (en) | 2009-09-16 |
| CN101542264B (en) | 2012-03-14 |
| TW200844423A (en) | 2008-11-16 |
| CN101535039B (en) | 2013-10-23 |
| TWI358537B (en) | 2012-02-21 |
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