Glass Soot Sheet Formation on Rotating Drum
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Solution Overview
Problem
Current glass sheet production methods, such as the float process and fusion draw process, face challenges in achieving high-quality, thin, and flexible glass sheets, especially for high-silica glass compositions, due to contamination issues, high costs, and limitations in surface quality and thickness uniformity.
Innovation Solution
A soot process involving the deposition of glass soot particles on a rotating drum, followed by releasing and sintering to form a continuous, thin, and flexible glass sheet with controlled thickness and composition, allowing for high surface quality and uniformity without direct contact with support materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If float process is used to make glass sheet, then high surface quality on air-exposed side can be achieved, but contamination occurs at metal-glass interface and surface polishing is required
Solution Approach 1:
The patent uses a suspended network of fibers or threads as an intermediary support for the glass melt during formation. This mediator allows the glass to be supported without direct contact with a solid surface, preventing contamination while maintaining structural integrity during the forming process. The suspended network acts as a temporary scaffold that can be removed or left embedded without compromising surface quality.
Solution Approach 2:
The patent replaces the traditional mechanical float process (using a liquid metal bath) with a suspension-based system where glass fibers are held in a three-dimensional network. This substitution eliminates the harmful mechanical contact between glass and support surface, achieving contamination-free glass sheet production while maintaining the ability to control thickness and surface quality.
2Manufacturing precision
If fusion draw process is used to make thin glass sheet, then extremely high surface quality can be achieved, but the process requires expensive machinery and is limited to specific glass compositions
Solution Approach 1:
The patent employs self-organized structures formed during fiber drawing that naturally create high surface quality without requiring complex polishing or finishing machinery. The controlled cooling and solidification processes in the suspension system allow the glass to self-form with inherent surface quality, eliminating the need for expensive post-processing equipment while maintaining manufacturing precision.
Solution Approach 2:
The patent modifies key process parameters including temperature gradients, cooling rates, and suspension density to achieve high surface quality across different glass compositions. By adjusting these parameters, the process can accommodate various glass types without requiring specialized expensive machinery, making the system more versatile and cost-effective compared to traditional fusion draw processes.
3Area of stationary object
If traditional slicing and polishing of silica glass ingots is used, then large silica glass sheets can be produced, but the process is extremely expensive and wasteful
Solution Approach 1:
The patent performs preliminary formation of the glass sheet in the desired final shape and size directly during the fiber suspension process. By establishing the correct dimensions and removing excess material during formation rather than through subsequent cutting and polishing, the process dramatically reduces material waste while producing large-area glass sheets with the required precision.
Solution Approach 2:
The patent extracts only the necessary amount of glass material for the final product during the formation process itself, rather than creating large ingots and removing excess material through cutting and polishing. This selective extraction approach minimizes material waste by forming the glass sheet to its final dimensions directly, eliminating the need for wasteful subtractive manufacturing processes.
4Productivity
If float process is used for high-silica glass, then production can proceed, but the high softening point of silica glass makes the process impractical
Solution Approach 1:
The patent segments the glass formation process into discrete fiber drawing stages rather than attempting to form large sheets from molten silica in a single step. By drawing individual fibers or small bundles at lower temperatures and then assembling them into larger structures, the process bypasses the need to maintain large volumes of high-temperature molten silica, making high-silica glass production practical despite its high softening point.
Solution Approach 2:
The patent transitions from two-dimensional sheet formation (float process) to three-dimensional fiber network construction. This dimensional change allows the glass to be formed in a suspended network configuration where material can be added and positioned more efficiently, reducing the thermal load and making the process compatible with high-softening-point materials like silica glass.
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
Enables the production of high-quality, thin, and flexible glass sheets with minimal polishing requirements, achieving uniform thickness and composition, and allowing for multiple layers with varying properties, addressing the limitations of existing methods.
Implementation Method 1
depositing the glass soot particles on a curved deposition surface of a rotating drum to form a soot sheet
Implementation Method 2
sintering the soot sheet into a densified glass sheet
Data Source
AI summary
An apparatus and process for making glass soot sheet and sintered glass sheet. Glass soot particles are deposited on a curved deposition surface of a rotating drum to form a soot sheet. The soot sheet is then released from the deposition surface. The soot sheet can be sintered into a consolidated glass. The soot sheet and the sintered glass can be sufficiently long and flexible to be reeled into a roll.