A process and apparatus for precision glass roll forming a supply of molten glass at a glass temperature of 1000° C. or higher with a pair of hot forming rolls having a surface temperature of about 500° C. or higher located vertically below the glass feed. The forming rolls thin the supplied stream
A process and apparatus for precision glass roll forming a supply of molten glass at a glass temperature of 1000° C. or higher with a pair of hot forming rolls having a surface temperature of about 500° C. or higher located vertically below the glass feed. The forming rolls thin the supplied stream of molten glass to produce a formed glass ribbon. A pair of cold sizing and texturing rolls maintained at a surface temperature of about 400° C. or lower or 300° C. or lower is located vertically below the forming rolls. The sizing and texturing rolls thin and texture the formed glass ribbon to produce a sized glass ribbon having a desired texture, thickness and thickness uniformity. The sized and textured glass ribbon may have a thickness of 1 mm or less that varies in thickness by no more than +/−0.025 mm.
대표청구항▼
1. An apparatus for precision roll forming and texturing glass or glass-ceramic sheets comprising: a glass feed device for supplying a supplied stream of molten glass or glass-ceramic;a pair of forming rolls maintained at a surface temperature of about 500° C. or higher, the forming rolls being spac
1. An apparatus for precision roll forming and texturing glass or glass-ceramic sheets comprising: a glass feed device for supplying a supplied stream of molten glass or glass-ceramic;a pair of forming rolls maintained at a surface temperature of about 500° C. or higher, the forming rolls being spaced closely adjacent each other defining a glass forming gap between the forming rolls with the glass forming gap located vertically below the glass feed device for receiving the supplied stream of molten glass and thinning the supplied stream of molten glass between the forming rolls to form a formed glass ribbon having a formed thickness;a pair of sizing rolls maintained at a surface temperature of about 400° C. or lower, the sizing rolls each comprising an insulating cylinder having an outer glass sizing surface, at least one of the sizing surfaces having a textured surface,a first pair of spacer rings mounted adjacent each end of the insulating cylinder of the first of the sizing rolls, and a second pair of spacer rings mounted adjacent to each end of the insulating cylinder of the second of the sizing rolls, the first and second sizing rings comprising outer cylindrical bearing surfaces extending radially beyond the outer glass sizing surface of the respective insulating cylinder; anda translational drive device for pressing the outer cylindrical bearing surfaces of the first and second sizing rolls together with the first pair of spacer rings engaging the second pair of spacer rings and thereby defining the glass sizing gap between the pair of sizing rolls;wherein the glass sizing gap is located vertically below the forming rolls for receiving the formed glass ribbon and thinning and imparting texture to the formed glass ribbon to produce a sized glass ribbon having a desired thickness, a desired thickness uniformity, and a desired texture on at least one surface of the glass ribbon. 2. The apparatus of claim 1, wherein the outer cylindrical glass sizing surfaces of each of the sizing rolls are formed with a radius and concentricity with the rotational axis of the sizing roll that varies by no more than +/−0.0125 mm, whereby the thickness of the sized glass ribbon varies by no more than +/−0.025 mm. 3. The apparatus of claim 2, wherein the sizing gap has a thickness of 1 mm or less, whereby the sized glass ribbon has a thickness 1 mm or less. 4. The apparatus of claim 3, wherein the forming gap has a thickness of about 1.5 mm to about 2 mm. 5. A process for precision roll forming glass or glass-ceramic into textured glass sheets comprising the steps of: supplying a vertical stream of molten glass or glass-ceramic from a feed device;forming the supplied stream of molten glass with a pair of forming rolls maintained at a surface temperature of about 500° C. or higher or about 600° C. or higher to form a formed glass ribbon having a formed thickness, the forming rolls being spaced closely adjacent each other defining a glass forming gap between the forming rolls with the glass forming gap located vertically below the glass feed device; andsizing the formed ribbon of glass with a pair of sizing rolls maintained at a surface temperature of about 400° C. or lower, the sizing rolls being spaced closely adjacent each other defining a glass sizing gap between the sizing rolls with the glass sizing gap located vertically below the forming rolls, at least one of the sizing rolls having a textured surface that imparts a texture to at least one surface of the glass ribbon, thereby producing a sized and textured glass ribbon having a desired thickness less than the formed thickness, a desired texture on at least one surface of the glass ribbon, and a desired thickness uniformity,wherein the sizing rolls each comprise as insulating cylinder having an outer glass sizing surface, a first pair of spacer rings mounted adjacent each end of the insulating cylinder of the first of the sizing rolls, and a second pair of spacer rings mounted adjacent each end of the insulating cylinder of the second of the sizing rolls, the first and second sizing rings comprising outer cylindrical bearing surfaces extending radially beyond the outer glass sizing surface of the respective insulating cylinder; andwherein a transitional drive device presses the outer cylindrical bearing surfaces of the first and second sizing rolls together with the first pair of spacer rings engaging the second pair of spacer rings thereby defining a thickness of the glass sizing gap. 6. The process of claim 5, wherein the sizing step comprises maintaining the pair of sizing rolls at a surface temperature of about 300° C. or lower. 7. The process of claim 6, wherein the molten glass is supplied at a glass viscosity in a range of from about 200 poise to about 10,000 poise. 8. The process of claim 6, wherein the molten glass is supplied at glass viscosity of about 10,000 poise or higher. 9. The process of claim 5, wherein the sizing step comprises maintaining the pair of sizing rolls at a surface temperature of about 200° C. or lower. 10. The process of claim 5, wherein a thickness uniformity of the sized glass ribbon varies by no more than +/−0.025 mm. 11. The process of claim 10, wherein the sized glass ribbon has a thickness of 1 mm or less. 12. The process of claim 11, wherein the formed glass ribbon has a thickness of about 1.5 mm to about 2 mm. 13. The process of claim 5, wherein the glass feed device feeds the stream of molten glass to the forming rolls at a glass temperature of about 1000° C. or higher.
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