Methods and apparatus for forming a glass ribbon
First Claim
1. A method of forming a glass ribbon with at least one forming roll and a forming body spaced to define a glass forming gap between the forming roll and forming body, wherein the forming roll comprises a working zone portion comprising a working zone surface including a length extending along a rotation axis of the forming roll, wherein the working zone portion is defined by a first thermal resistance boundary extending at a first acute angle relative to the rotation axis of the forming roll and a second thermal resistance boundary extending at a second acute angle relative to the rotation axis of the forming roll, and the first acute angle and the second acute angle face away from one another in opposite directions of the rotation axis, the method comprising:
- supplying a stream of molten glass; and
feeding the stream of molten glass through the gap to form a glass ribbon including a formed thickness, wherein the first thermal resistance boundary and the second thermal resistance boundary facilitate substantial uniform radial expansion of the working zone surface relative to the rotation axis across the length of the working zone surface in response to heating of the working zone portion by the molten glasswherein the working zone portion comprises a circumferential dovetail portion that includes a trapezoidal cross-sectional portion flared in a radial direction extending away from the rotation axis of the forming roll, and the circumferential dovetail portion is defined by the first thermal resistance boundary and the second thermal resistance boundary.
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Accused Products
Abstract
A roll forming apparatus includes at least one forming roll being spaced from a forming body to define a gap. The forming roll includes a working zone portion having a working zone surface with a length extending along a rotation axis of the forming roll and a thermal resistance boundary extending at an acute angle relative to the rotation axis. In further examples, methods include the step of feeding a stream of molten glass through the gap to form a glass ribbon including a formed thickness. The thermal resistance boundary facilitates substantial uniform radial expansion of the working zone surface relative to the rotation axis across the length of the working zone surface in response to heating of the working zone portion by the molten glass.
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Citations
17 Claims
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1. A method of forming a glass ribbon with at least one forming roll and a forming body spaced to define a glass forming gap between the forming roll and forming body, wherein the forming roll comprises a working zone portion comprising a working zone surface including a length extending along a rotation axis of the forming roll, wherein the working zone portion is defined by a first thermal resistance boundary extending at a first acute angle relative to the rotation axis of the forming roll and a second thermal resistance boundary extending at a second acute angle relative to the rotation axis of the forming roll, and the first acute angle and the second acute angle face away from one another in opposite directions of the rotation axis, the method comprising:
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supplying a stream of molten glass; and feeding the stream of molten glass through the gap to form a glass ribbon including a formed thickness, wherein the first thermal resistance boundary and the second thermal resistance boundary facilitate substantial uniform radial expansion of the working zone surface relative to the rotation axis across the length of the working zone surface in response to heating of the working zone portion by the molten glass wherein the working zone portion comprises a circumferential dovetail portion that includes a trapezoidal cross-sectional portion flared in a radial direction extending away from the rotation axis of the forming roll, and the circumferential dovetail portion is defined by the first thermal resistance boundary and the second thermal resistance boundary. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of forming a glass ribbon with at least one forming roll and a forming body spaced to define a glass forming gap between the forming roll and forming body, wherein the forming roll comprises a working zone portion comprising a working zone surface including a length extending along a rotation axis of the forming roll, wherein the working zone portion comprises a circumferential dovetail portion that includes a trapezoidal cross-sectional portion flared in a radial direction extending away from the rotation axis of the forming roll, and the circumferential dovetail portion is defined by a first thermal resistance boundary and a second thermal resistance boundary, the method comprising:
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supplying a stream of molten glass; and feeding the stream of molten glass through the gap to form a glass ribbon including a formed thickness, wherein the first thermal resistance boundary and the second thermal resistance boundary facilitate substantial uniform radial expansion of the working zone surface relative to the rotation axis across the length of the working zone surface in response to heating of the working zone portion by the molten glass. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification