Glass Flake Production Using Insulated Spinning Cup
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Solution Overview
Problem
Existing methods for producing glass flakes with a mean thickness below 350 nm are inefficient and pose safety risks due to high voltage requirements and inefficient heating processes, such as those described in EP 0 289 240 and WO 2004/056716, which often result in inconsistent flake thickness and production issues.
Innovation Solution
The method involves carefully controlling parameters like glass composition, melt temperature, and heat dissipation in the spinning cup, using insulation and RF heating to maintain high temperatures and produce glass flakes with a mean thickness ranging from 10 to 350 nm, eliminating the need for external RF heating and reducing heat loss, thereby enabling the production of uniformly thin flakes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If high voltage electrical heating is used to heat the descending glass stream, then heating efficiency is improved, but safety risk increases due to electrocution hazard
Solution Approach 1:
The patent replaces the electrical heating system (which uses high voltage current through electrodes) with a mechanical/thermal system using an insulated spinning cup heated by hot gas or radiant heating. This substitution eliminates the electrocution hazard while maintaining the necessary heating function for producing thin glass flakes.
2Shape
If the spinning cup is cooled to solidify the glass stream, then flake formation is improved, but heating efficiency deteriorates due to reduced heat transfer
Solution Approach 1:
The patent divides the thermal management into separate zones: the spinning cup is insulated and heated to maintain high temperature for efficient energy use, while the flake formation zone (after the cup) allows controlled cooling and solidification. This segmentation resolves the contradiction by decoupling the heating function from the solidification function.
3Temperature
If external RF heating is used to maintain high temperatures, then temperature control is improved, but device complexity increases
Solution Approach 1:
The patent makes the spinning cup self-heating through insulation that traps radiant heat from the glass stream itself and the heating zone. The cup maintains its temperature without requiring complex external RF heating systems, thereby simplifying the device while maintaining effective temperature control for thin flake production.
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 allows for the consistent production of glass flakes with a mean thickness as low as 10 to 100 nm, improving operational safety and efficiency by maintaining high temperatures and reducing heat loss, thus overcoming the limitations of previous methods.
Implementation Method 1
a spinning cup to produce a flat film of molten glass emanating radially from the rim of a rotating cup
Implementation Method 2
The film is fed between two plates, forming an annular venturi and is super-cooled with forced air
Implementation Method 3
The film is fed between two plates, forming an annular venturi and is super-cooled with forced air. The film is broken up due to the high velocity air stream and the drag (frictional resistance) imparted by it
Data Source
AI summary
The present invention provides flake having a thickness up to 350 nm, the flake being made of basalt, ceramics, alumina, graphite, a metal, a metal oxide or a combination of any two or more thereof. Equipment for manufacturing such flake is also described as is a method for the manufacture of the flake. The equipment comprises a cup mounted for rotation and for receiving molten glass. The equipment further comprises either insulating means extending at least partially around said cup or means for heating the cup while it is rotating.