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1、FromWikipedia,thefreeencyclopediaFloatGlassFloatglassisasheetofglassmadebyfloatingmoltenglassonabedofmoltenmetal,typicallytin,althoughleadandvariouslowmeltingpointalloyswereusedinthepast.Thismethodgivesthesheetuniformthicknessandveryflatsurfaces.Modernwindo
2、wsaremadefromfloatglass.Mostfloatglassissoda-limeglass,butrelativelyminorquantitiesofspecialtyborosilicate[1]andflatpaneldisplayglassarealsoproducedusingthefloatglassprocess.[2]ThefloatglassprocessisalsoknownasthePilkingtonprocess,namedaftertheBritishglassm
3、anufacturerPilkington,whichpioneeredthetechnique(inventedbySirAlastairPilkington)inthe1950s./*http://pla888.qzone.qq.com*/HistoryUntilthe16thcentury,windowglassorflatglasswasgenerallycutfromlargediscs(orrondels)ofcrownglass(冕牌玻璃).Largersheetsofglassweremade
4、byblowinglargecylinderswhichwerecutopenandflattened,thencutintopanes.Mostwindowglassintheearly19thcenturywasmadeusingthecylindermethod(柱状法).The'cylinders'were6to8feet(1.8to2.4m)longand10to14inches(250to360mm)indiameter,limitingthewidththatpanesofglasscouldb
5、ecut,andresultinginwindowsdividedbytransoms(横梁)intorectangularpanels(矩形面板).Thefirstadvancesinautomatingglassmanufacturingwerepatentedin1848byHenryBessemer,anEnglishengineer.Hissystemproducedacontinuousribbon(带)offlatglassbyformingtheribbonbetweenrollers.Thi
6、swasanexpensiveprocess,asthesurfacesoftheglassneededpolishing.Iftheglasscouldbesetonaperfectlysmoothbodythiswouldreducecostsconsiderably.Attemptsweremadetoformflatglassonamoltentinbath,notablyintheUS.Severalpatentsweregranted,butthisprocesswasunworkable.Bef
7、orethedevelopmentoffloatglass,largersheetsofplateglassweremadebycastingalargepuddleofglassonanironsurface,andthenpolishingbothsides,acostlyprocess.Fromtheearly1920s,acontinuousribbonofplateglasswaspassedthroughalengthyseriesofinlinegrinders(联机磨床)andpolisher
8、s,reducingglasslossesandcost.Glassoflowerquality,sheetglass,wasmadebydrawingupwardsfromapoolofmoltenglassathinsheet,heldattheedgesbyrollers.Asitcooledtherisingsheetstiffenedandcouldthenbecut.Thetwosurf
