RF Plasma Pre-melting for Homogeneous Glass Intermediate Particles
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Solution Overview
Problem
Current glass melting processes are costly and time-consuming, often resulting in inhomogeneous glass melts due to bubble formation, sludge layers, and difficulties with unconventional glass materials, which can lead to defects in the final product.
Innovation Solution
The method involves bringing glass batch materials into contact with a plasma to form homogeneous, spheroid-shaped glass intermediate particles, which are then cooled and optionally further melted to produce a homogeneous glass melt, reducing defects and processing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional high temperature melting processes are used, then glass batch materials can be melted, but the process is costly and time-consuming with inhomogeneous glass melts containing bubbles and sludge layers
Solution Approach 1:
The patent applies preliminary action by pre-melting glass batch materials in small batches using RF plasma before combining them in a large melter. This pre-melting step creates homogeneous glass intermediate particles that melt more uniformly in the main batch, eliminating the need for prolonged stirring and reducing overall processing time while improving melt homogeneity.
Solution Approach 2:
The patent segments the melting process into two distinct stages: (1) pre-melting of small batches in RF plasma to create homogeneous intermediate particles, and (2) combining and final melting in a large melter. This segmentation allows each stage to be optimized independently, achieving both speed and homogeneity.
2Temperature
If high temperatures are used to melt glass batch materials, then melting can be achieved, but expensive metals and specially designed high temperature refractory materials are required
Solution Approach 1:
The patent replaces traditional high temperature furnace heating with RF plasma heating. RF plasma generates electromagnetic fields that directly couple with the glass batch materials, enabling rapid heating to melting temperatures without requiring the entire melter structure to withstand extreme temperatures, thus reducing equipment costs.
Solution Approach 2:
The patent changes the heating mechanism from thermal conduction through furnace walls to direct RF plasma heating. This parameter change allows localized high temperature zones only where needed for melting, rather than requiring the entire processing equipment to be designed for sustained high temperatures.
3Manufacturing precision
If small batches are processed to prevent bubbles and inhomogeneities, then glass quality improves, but processing time and expense increase
Solution Approach 1:
The patent merges the advantages of small-batch processing with large-batch production by creating homogeneous glass intermediate particles in small RF plasma batches, then combining multiple batches in a large melter. The pre-homogenized particles ensure high quality while the large-scale combining maintains productivity.
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
This approach results in a more efficient and cost-effective glass melting process that minimizes defects such as bubbles and inhomogeneities, enabling the production of high-quality glass substrates suitable for high-resolution applications.
Implementation Method 1
processing glass precursor materials using dielectric or radio frequency ('RF') plasma
Implementation Method 2
bringing the glass batch materials into contact with a plasma
Implementation Method 3
the glass intermediate particles may be cooled by a tangential flow of gas
Data Source
AI summary
The disclosure relates to methods for forming pre-melting and/or melting glass batch materials comprising bringing glass batch materials into contact with a plasma plume for a residence time sufficient to form substantially homogeneous, spheroid-shaped glass intermediate particles. The glass batch materials may flow in a cyclonic pattern in the plasma plume for increased residence time. The glass intermediate particles may be cooled with a tangential flow of gas to produce a cyclonic flow within the collection vessel. Also disclosed herein are glass intermediate particles comprising at least about 45 wt % of alumina and/or silica and less than about 55 wt % of at least one oxide of boron, V magnesium, calcium, sodium, strontium, tin, and/or titanium, wherein the glass intermediate particles are substantially homogenous and substantially spheroid in shape and have an average particle size ranging from about 5 to about 1,000 microns.