Abstract:
A strengthened glass or glass ceramic sheet has a roughness of greater than 0.05 nm Ra and less than 0.08 nm Ra over an area of 10 µm x 10 µm and has the property that, excluding areas within three sheet thicknesses of the outer edge surface of the sheet, the slope of a measured value of a thermally affected property of glass over distance along the first major surface of the sheet is higher bordering one or more lower-cooling-rate-effect-exhibiting areas on the first surface of the sheet than elsewhere on the first surface of the sheet, and at least one of said one or more areas has a shortest linear dimension, in a direction parallel to the first major surface, of less than 100000 µm.
Abstract:
A strengthened glass sheet product as well as a process and an apparatus for making the product. The process comprises cooling the glass sheet by non-contact thermal conduction for sufficiently long to fix a surface compression and central tension of the sheet. The process results in thermally strengthened glass sheets having improved breakage properties.
Abstract:
A glass sheet thermally strengthened such that at the first major surface is under compressive stress; the sheet having an a characteristic 2D autocorrelation matrix c(x,y) given by c(x,y) = F -1 (F(g)•F ˆ (g)) where F is a 2D Fourier transform and ˆ represents a complex conjugate operation and g is a high pass filtered data array given by g(x,y) = F -1 (F(f)(1-F(h)) where h is a spatial 2D low pass filter array and f is a square data array of Shear 0 and Shear 45 data, taken over an area away from any birefringence edge effects on the sheet, wherein an autocorrelation peak maximum width of the matrix c(x,y) at 40% of peak height, for the c(x,y) matrices from both the Shear 0 and Shear 45 data, is between 1 and 5 mm.
Abstract:
A method for manufacturing high quality glass panel includes producing a substantially planar glass sheet having a first portion and an end portion, wherein the first portion and the end portion are both in a substantially vertical first orientation, and twisting the end portion of the glass sheet to a second orientation that is different from the first orientation while the first portion of the glass sheet remains in a first orientation and the end portion of the glass sheet remains attached to the first portion of the glass sheet. The method further includes heat treating the end portion of the glass sheet.
Abstract:
Equipment and manufacturing processes allow for strengthened glass or glass ceramic articles having unique stress profiles, such as high negative tensile stresses and steep tensile stress curves with respect to depth, in strengthened glass or glass ceramic articles that are thin and/or have large-area structures for a given degree of thermal temping.
Abstract:
A covering material, resistant to high temperatures and intended to be inserted between tools and plates of hot glass during glass heating, bending or tempering processes, wherein said covering material comprises a textile fabric, characterized in that said textile fabric comprises poly(p-phenylene-2, 6-benzobisoxazole) fibers.