Thermal Separation of Continuous Glass Ribbons
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Solution Overview
Problem
Existing methods for separating glass sheets from continuous glass ribbons, such as mechanical scoring and laser scoring, result in low yields and undesirable warp due to differences in thermal expansion coefficients and irregular surfaces, making it difficult to achieve robust and reliable separation.
Innovation Solution
A glass manufacturing apparatus that includes a translatable support portion with a heating apparatus to apply heat preferentially to a desired line of separation on the continuous glass ribbon, combined with a scoring device to initiate a flaw, facilitating the separation of glass sheets while minimizing warp and enhancing strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mechanical scoring or laser scoring is used to separate glass sheets from continuous glass ribbons, then separation can be achieved, but the yield is low and undesirable warp occurs
Solution Approach 1:
The patent applies thermal energy to locally heat the continuous glass ribbon at the desired separation line, changing the temperature parameter to create a thermal gradient. This thermal parameter change softens the glass locally, enabling clean separation without mechanical stress that causes warp, thereby improving both yield and manufacturing precision
Solution Approach 2:
The patent replaces traditional mechanical scoring methods with a thermal field approach. Instead of using mechanical tools to score and break the glass, a heating apparatus applies thermal energy to the separation line, substituting mechanical action with thermal action to achieve separation without causing warp or reducing yield
2Ease of manufacture
If mechanical scoring is used on continuous glass ribbons with irregular surfaces and high stress, then separation can be initiated, but the process becomes complicated and yields are low
Solution Approach 1:
The patent replaces complex mechanical scoring operations with a simpler thermal heating process. The heating apparatus directly applies thermal energy to the separation line without needing to mechanically score the irregular surface, simplifying the manufacturing process and improving yield by avoiding complications from mechanical scoring on stressed, irregular surfaces
Solution Approach 2:
The patent changes the operational parameter from mechanical scoring to thermal heating. This parameter change simplifies the ease of manufacture by eliminating the complexity of scoring irregular surfaces with mechanical tools, while simultaneously improving productivity through more reliable separation with higher yield
3Device complexity
If glass sheets are sectioned by simple scoring and bending, then the process is simple, but undesirable warp results
Solution Approach 1:
The patent substitutes the simple but problematic mechanical bending process with a thermal heating process. Instead of bending scored glass (which causes warp), the heating apparatus applies thermal energy to the separation line, maintaining process simplicity while eliminating the warp problem by using thermal rather than mechanical separation
Solution Approach 2:
The patent changes the separation parameter from mechanical bending to thermal heating. This parameter change preserves the simplicity of the process (heating is as simple as bending) while eliminating the harmful warp effect, as thermal separation does not induce the same mechanical stresses that cause distortion in the glass shape
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution improves the yield and quality of glass sheet separation by creating a thermal gradient that aids in severing the ribbon, reducing warp and enhancing the strength of the separated glass sheets, making them more robust for electronic device applications.
Implementation Method 1
preferentially applying heat to a first side of the continuous glass ribbon at the desired line of separation
Implementation Method 2
The difference in the coefficients of thermal expansion between the core layer and the cladding layers
Data Source
AI summary
Apparatuses and methods for heating moving continuous glass ribbons at desired lines of separation and/or for separating glass sheets from continuous glass ribbons are disclosed. An apparatus includes a translatable support portion and a heating apparatus coupled to the support portion. The heating apparatus is configured to contact the continuous glass ribbon across at least a portion of a width of the continuous glass ribbon at the desired line of separation as the support portion moves in a draw direction, thereby preferentially applying heat to a first side of the continuous glass ribbon at the desired line of separation as the continuous glass ribbon moves in the draw direction.