Vehicle Window Glass Coating Without Masking Tape
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Solution Overview
Problem
The existing methods for forming functional thin films on vehicle window glasses using a liquid phase deposition process face inefficiencies due to the need for masking tapes, which can cause optical transmission distortion and peeling issues, especially when applied over ceramic shielding layers.
Innovation Solution
A method involving the application of a coating liquid directly onto the glass sheet with a ceramic shielding layer, where the liquid is fed from a nozzle moving along the glass's edge, limiting the flow distance to 30 cm or less, and dried to form a functional thin film with increasing thickness from one end to the other, ensuring the film adheres to both transparent and shield regions without masking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a masking tape is used to mask the ceramic shielding layer before applying coating liquid, then the functional thin film can be formed on the glass sheet, but optical transmission distortion occurs due to local increase in film thickness caused by coating liquid pool formation
Solution Approach 1:
The patent removes the masking tape step entirely from the manufacturing process. By controlling the application conditions of the coating liquid (feeding amount, application speed, drying conditions), the process directly forms the functional thin film on both the glass sheet and ceramic shielding layer without requiring masking, thereby eliminating optical transmission distortion and simplifying the manufacturing operation
Solution Approach 2:
The patent optimizes multiple process parameters including the feeding amount of coating liquid, application speed, and drying conditions to prevent pool formation. By adjusting these parameters, the coating liquid is controlled to form a uniform film without excessive accumulation at the edges, eliminating the need for masking while maintaining film thickness uniformity
2Manufacturing precision
If masking tape is attached to mask the ceramic shielding layer, then the functional thin film formation is enabled, but production efficiency is significantly reduced due to the masking operation
Solution Approach 1:
The masking operation is completely eliminated from the mass production process. The patent achieves direct formation of the functional thin film on the entire surface including the ceramic shielding layer by controlling coating liquid application parameters, removing the time-consuming masking and demasking steps while maintaining film formation quality
Solution Approach 2:
The coating liquid is applied continuously across the entire surface of the glass sheet without interruption for masking operations. The process maintains continuous production flow by adjusting application speed and drying conditions to ensure uniform film formation throughout, eliminating downtime associated with masking operations
3Productivity
If the coating liquid is applied without masking the ceramic shielding layer, then production efficiency is improved, but the functional thin film may peel off from the ceramic shielding layer surface
Solution Approach 1:
The patent optimizes the composition and application parameters of the coating liquid to ensure proper adhesion to the ceramic shielding layer. By adjusting the feeding amount, application speed, and drying conditions, the coating liquid forms a film with sufficient bonding strength to the ceramic surface without requiring masking, thereby maintaining both productivity and reliability
Solution Approach 2:
The coating liquid formulation is designed in advance to ensure compatibility and adhesion with the ceramic shielding layer surface. The preliminary preparation of the coating liquid composition and application parameters ensures that the film will adhere properly to both the glass sheet and ceramic shielding layer when applied without masking
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 prevents peeling of the functional thin film from the ceramic shielding layer, enhances production efficiency, and maintains the desired film thickness for effective functionality while minimizing aesthetic defects.
Implementation Method 1
A metal compound reactive with hydroxyl groups (OH groups) present on the surface of a glass sheet is added to the coating liquid. The metal compound reacts with hydroxyl groups on the surface of a glass sheet to fix a functional thin film on the surface of the glass sheet.
Implementation Method 2
a liquid phase deposition process in which a coating liquid is fed to form a film
Data Source
AI summary
Provided is a method for producing a vehicle window glass, the method being adapted to prevent peeling-off of a functional thin film from a ceramic shielding layer without masking the ceramic shielding layer with a masking tape. This production method includes: an application step of feeding a coating liquid for forming the functional thin film onto a principal surface of a glass sheet on which the ceramic shielding layer has been formed beforehand, so as to allow the coating liquid to flow in a predetermined direction on the principal surface; and a drying step of drying the fed coating liquid. In the application step, the glass sheet is set in such a position that the predetermined direction coincides with a first direction in which the maximum length of the principal surface is 30 cm or less (rather than with a second direction in which the maximum length is more than 50 cm) and thus that the distance the coating liquid flows on the principal surface is limited to 30 cm or less.