Glass Substrate Thermoforming with Sacrificial Siloxane Coating
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Solution Overview
Problem
The existing methods for processing window members, particularly those using thermoforming, lack effective protection for glass substrates during high-temperature and high-pressure processes, leading to surface damage and the need for additional polishing to remove mold marks, which increases complexity and cost.
Innovation Solution
A method involving the application of a protective coating agent containing siloxane derivatives and inorganic sol compounds onto glass substrates, followed by heat treatment to form a protective layer, thermoforming under high temperature and pressure, and subsequent removal of the protective layer using alkaline solutions, which prevents surface damage and eliminates the need for additional polishing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective layer is applied before thermoforming, then surface protection during high-temperature processing is improved, but device complexity increases due to additional coating and removal steps
Solution Approach 1:
The protective coating is applied to the glass substrate before the thermoforming process to prevent surface damage during high-temperature and high-pressure processing. This preliminary protective action ensures the surface remains intact throughout the forming process, eliminating the need for subsequent surface repair or polishing operations.
Solution Approach 2:
The protective coating serves as a temporary sacrificial layer that is deliberately applied, used during thermoforming, and then removed. The coating is designed to be easily removable after serving its protective function, allowing recovery of the underlying glass surface in a clean state without requiring additional polishing steps.
2Ease of manufacture
If conventional thermoforming is performed without protective coating, then process simplicity is maintained, but surface damage and mold marks occur requiring additional polishing
Solution Approach 1:
The protective coating is applied in advance before thermoforming to prevent surface damage during the high-temperature processing. This preliminary protection allows the thermoforming to proceed with simple processing conditions while maintaining high surface quality, as the coating shields the glass from direct contact with molds and prevents thermal damage.
Solution Approach 2:
The protective coating acts as an intermediary layer between the glass substrate and the external environment during thermoforming. It mediates the interaction between the glass surface and the high-temperature processing conditions, preventing direct damage while allowing the thermoforming process to proceed without complex modifications.
3Manufacturing precision
If protective coating is applied and removed, then surface quality is improved without additional polishing, but processing time increases due to coating application and removal steps
Solution Approach 1:
The protective coating is designed as a temporary sacrificial layer that is easily removable after serving its protective function. The removal process is simplified and rapid, allowing the coating to be discarded without significant time penalty. This approach maintains high surface quality while minimizing the time investment in coating application and removal.
Solution Approach 2:
The protective coating undergoes parameter changes during the process - it is applied in a coating state, then transformed during heat treatment to form a protective layer, and finally removed through chemical or mechanical means. These parameter changes are optimized to occur rapidly, minimizing the total time added to the manufacturing process while achieving the desired surface quality improvement.
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 method effectively protects glass substrates during thermoforming, maintaining surface roughness and transparency, and allows for the production of window members with excellent optical characteristics without requiring additional surface processing steps.
Implementation Method 1
performing a heat treatment on the applied protective coating agent to form a protective layer on the glass substrate
Implementation Method 2
capable of protecting a surface even under a processing process condition of a high-temperature and high-pressure
Implementation Method 3
thermoforming the glass substrate
Implementation Method 4
thermoforming the glass substrate may include applying a pressure to the glass substrate
Implementation Method 5
The removing of the protective layer may be performed by applying a strong alkaline solution to the thermoformed glass substrate
Data Source
AI summary
A method of processing a window member according to an embodiment includes applying a protective coating agent including at least one of a siloxane derivative and an inorganic sol compound onto a glass substrate, performing a heat treatment on the applied protective coating agent to form a protective layer on the glass substrate, thermoforming the glass substrate, and removing the protective layer, so as to process the window member without degradation of optical characteristics and without surface damages of the glass substrate.