Glass Ribbon Surface Smoothing via Localized Heating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for manufacturing glass ribbons often result in high surface roughness, which requires subsequent processing like chemical etching or mechanical polishing to achieve low surface roughness, increasing costs and waste.
Innovation Solution
Heating a portion of the glass-forming ribbon to a specific depth while it is in a viscous state, reducing surface roughness without the need for post-forming processing, by localizing the heating to minimize energy consumption and prevent thickness changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If post-forming processing (chemical etching, mechanical grinding, mechanical polishing) is used to reduce surface roughness, then surface roughness is reduced, but manufacturing complexity and processing time increase
Solution Approach 1:
The patent applies preliminary action by heating the glass-forming ribbon during the forming process itself, before the glass solidifies. This pre-heating modifies the surface properties during formation, eliminating the need for subsequent post-forming processing steps like chemical etching or mechanical polishing. The heating is applied when the glass is still in a viscous state, allowing surface smoothing to occur naturally during the forming operation.
2Manufacturing precision
If post-forming processing is applied to reduce surface roughness, then surface quality is improved, but manufacturing time and cost increase
Solution Approach 1:
The patent merges the surface roughness reduction function with the glass forming operation itself. By heating the glass-forming ribbon during forming, the surface smoothing action is combined with the shaping process, eliminating the need for separate post-forming processing steps. This integration maintains high surface quality while improving manufacturing efficiency and reducing production time.
3Manufacturing precision
If heating is applied to reduce surface roughness, then surface quality is improved, but energy consumption increases
Solution Approach 1:
The patent applies local quality by heating only the surface layer of the glass-forming ribbon, rather than heating the entire glass mass. This localized heating approach focuses thermal energy on the specific region that needs surface roughness reduction, minimizing overall energy consumption while achieving the desired surface quality improvement.
4Manufacturing precision
If heating depth is increased to reduce surface roughness, then surface quality is improved, but glass thickness uniformity deteriorates
Solution Approach 1:
The patent uses local quality by restricting heating to a shallow depth at the glass surface, preventing excessive heat penetration that would cause thickness variations. This controlled localized heating achieves surface roughness reduction while maintaining glass thickness uniformity by avoiding overheating of the bulk material.
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 method produces glass ribbons with surface roughness as low as 5 nanometers or less, reducing waste and processing costs, while meeting stringent design specifications without subsequent processing.
Implementation Method 1
heating the first major surface of the glass-forming ribbon at a target location while the glass-forming ribbon is traveling along the travel path. The heating can increase a temperature of the glass-forming ribbon at the target location to a heating depth of about 250 micrometers or less from the first major surface
Implementation Method 2
The glass-forming ribbon can comprise an average viscosity at the target location. Prior to the heating, the glass-forming ribbon at the target location can comprise an average viscosity in a range from about 1,000 Pascal-seconds to about 1011 Pascal-seconds
Data Source
AI summary
A method of manufacturing a glass ribbon can comprise flowing a glass-forming ribbon along a travel path. The glass-forming ribbon can comprise a first major surface and a second major surface opposite the first major surface. A thickness can be defined between the first major surface and the second major surface. The method can comprise heating the first major surface of the glass-forming ribbon at a target location of the travel path while the glass-forming ribbon is travelling along the travel path. The heating can increase a temperature of the glass-forming ribbon at the target location to a heating depth of about 250 micrometers or less from the first major surface. The method can comprise cooling the glass-forming ribbon into the glass ribbon. Prior to the heating, the glass-forming ribbon at the target location can comprise an average viscosity in a range from about 1,000 Pascal-seconds to about 1011 Pascal-seconds.