Glass Article Heating With Matrix Heat Sources for Surface Protection
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Solution Overview
Problem
Glass articles used in portable electronic devices are prone to damage such as dents or cracks during heat treatment, which reduces their compressive stress and strength, necessitating a solution for rapid heat treatment without compromising compressive stress.
Innovation Solution
A glass article manufacturing apparatus with thermally conductive side portions and heat supply portions arranged in a matrix form, allowing for rapid heating rates of 10 Kelvin per minute or greater, and independent operation of heat supply portions to mitigate surface damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat treatment is performed on strengthened glass article, then damage such as dents or cracks is reduced, but compressive stress is degraded and strength decreases
Solution Approach 1:
The patent applies rapid heating rate (10 K/min or greater) to quickly pass through the critical temperature zone, minimizing the time the glass spends at temperatures where damage can occur while still achieving the desired stress relief and surface quality improvement
2Reliability
If heat treatment time is extended to reduce damage, then surface quality improves, but compressive stress degrades more significantly
Solution Approach 1:
The patent changes the heating rate parameter to 10 K/min or greater, transforming the heat treatment process from a slow, stress-degrading operation to a rapid process that maintains compressive stress while still improving surface quality by preventing dents and cracks
3Strength
If heating rate is increased to maintain compressive stress, then heat treatment time is reduced, but surface damage may increase
Solution Approach 1:
The rapid heating rate allows the glass to quickly pass through the critical temperature range where damage occurs, achieving both stress maintenance and surface quality improvement by minimizing exposure time at problematic temperatures
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 apparatus effectively prevents damage to glass articles during heat treatment, maintaining high compressive stress and strength by minimizing surface defects through rapid and controlled heating.
Implementation Method 1
a plurality of heat supply portions disposed on each of the side portions
Implementation Method 2
each of the heat supply portions may have a size of about 2 square centimeters (cm2) or greater and may include a halogen lamp
Implementation Method 3
the side portions may include a thermally conductive material... the thermally conductive material has a thermal conductivity of about 200 Watts per meter-Kelvin (W/mk) or greater
Data Source
AI summary
An apparatus for manufacturing a glass article includes a plurality of side portions spaced apart from each other; and a plurality of heat supply portions disposed on each of the side portions; where the side portions adjacent to each other are disposed to face each other, and a glass is allowed to be disposed between the adjacent side portions.