Sheet Glass Side Surface Roughness Control
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Solution Overview
Problem
Conventional sheet glass is prone to breakage when subjected to twisting forces due to its low reliability of flexibility, which is attributed to its surface roughness characteristics.
Innovation Solution
The manufacturing process involves heat-drawing a base-material glass sheet to achieve side surfaces with an average surface roughness of equal to or less than 0.2 micrometers, enhancing the flexibility and resistance to breakage by adjusting the thickness-reduction ratio and potentially polishing the surfaces to achieve Ra1 and Ra2 values of 0.01 μm and 0.05 μm or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sheet glass is used, then manufacturing is simple, but the glass breaks easily when twisted due to high surface roughness
Solution Approach 1:
The patent applies parameter changes by controlling the side surface roughness to be equal to or less than 0.2 micrometer through adjustments in the manufacturing process parameters, including heat treatment temperature and drawing speed, to achieve both high flexibility reliability and controlled surface quality
Solution Approach 2:
The patent applies local quality by specifically controlling only the side surface roughness (not the main surfaces) to be ≤0.2 μm, while allowing the main surfaces to maintain their original quality, thereby improving flexibility reliability without requiring complete surface polishing of the entire glass sheet
2Volume of moving object
If base-material glass sheet is softened and drawn to reduce thickness, then sheet glass of desired thickness is obtained, but side surface roughness increases reducing flexibility
Solution Approach 1:
The patent applies preliminary action by performing heat treatment at a temperature below the softening point before the drawing process, which pre-conditions the glass structure to maintain surface quality during subsequent thickness reduction, preventing roughness increase
Solution Approach 2:
The patent controls the drawing process by maintaining specific parameter ranges: heat treatment temperature below the softening point and controlled drawing speed, which enables thickness reduction while preserving side surface roughness at ≤0.2 μm
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 resulting sheet glass exhibits improved flexibility and resistance to twisting forces, with breakage-threshold angles significantly increased, allowing for wider application in flexible glass requirements and increased productivity in manufacturing.
Implementation Method 1
The base-material glass sheet is softened by heating, and is drawn to obtain sheet glass of a desired thickness
Data Source
AI summary
A sheet glass that has a side surface with an average surface roughness equal to or less than 0.2 μm is provided. Furthermore, a method of manufacturing a sheet glass is provided that includes processing a base-material glass sheet to obtain a sheet glass that has a side surface with an average surface roughness equal to or less than 0.2 μm. Moreover, a method of manufacturing a sheet glass is provided that includes processing a base-material glass sheet so that an average surface roughness of a side surface becomes equal to or less than a predetermined value according to a section modulus of the sheet glass that is to be manufactured.