Automotive Window Laminate With Reflective Coating in Ceramic Band
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Solution Overview
Problem
Automotive window laminates incorporating active or passive films are prone to degradation due to high temperatures, especially in the obscuration band region, which can cause damage and reduce functionality, and existing heat-reflective coatings are incompatible with ceramic enamels used in obscuration bands, leading to color changes and reduced performance.
Innovation Solution
A reflective coating is applied on the inward-facing surface of the outer glass sheet, overlapping with the ceramic band to block heat before it reaches the functional layers, and a ceramic band is used to seal and protect the reflective coating, maintaining appearance and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a heat-reflective coating is applied to block heat before it reaches functional layers, then heat absorption is reduced and functional layer degradation is prevented, but the coating is incompatible with ceramic enamels in obscuration bands, causing color changes and performance reduction
Solution Approach 1:
The patent divides the heat-reflective coating into separate zones: a first heat-reflective coating applied to areas without ceramic enamel, and a second heat-reflective coating applied to areas with ceramic enamel. This segmentation allows each coating to be optimized for its specific substrate, preventing color changes while maintaining heat reflection functionality.
Solution Approach 2:
The patent applies different coating compositions to different locations on the glass substrate. The first coating composition is used where ceramic enamel is absent, while a second, compatible coating composition is used where ceramic enamel is present. This local differentiation ensures optimal performance and compatibility in each region.
2Stability of the object's composition
If the reflective coating is applied to overlap with the ceramic band to seal and protect it, then aesthetic appearance is maintained and ceramic band is protected, but heat reflection effectiveness may be reduced in the overlapping region
Solution Approach 1:
The patent segments the coating application into two functional zones: a heat-reflective zone that overlaps with the ceramic band to provide sealing and protection, and a heat reflection zone that extends beyond the ceramic band to maximize thermal performance. This segmentation ensures both protective and reflective functions are fulfilled.
Solution Approach 2:
The heat-reflective coating serves multiple functions: it reflects heat to reduce energy loss, seals the ceramic band to prevent moisture ingress, and maintains aesthetic appearance by providing a uniform finish. The coating composition is designed to achieve all these functions simultaneously.
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 solution effectively reduces heat absorption, prevents degradation of functional layers, maintains aesthetic appearance, and ensures compatibility with ceramic enamels, enhancing the durability and efficiency of the window laminate.
Implementation Method 1
A reflective coating is applied on the inward-facing surface of the outer glass sheet, overlapping with the ceramic band to block heat before it reaches the functional layers
Implementation Method 2
If an electric current flows from the first conductive layer through the liquid crystals to the second conductive layer, the crystals will be orientated aligned with the electric current causing a change in colour and/or light transmission
Data Source
AI summary
The present invention is related to an automotive window laminate structure, including an inner glass sheet, and an outer glass sheet, said inner glass sheet and outer glass sheet situated parallel and mutually spaced apart, the inner glass sheet and outer glass sheet each including an inward facing surface and an outward facing surface, at least one thermoplastic laminated sheet structure, said thermoplastic laminated sheet structure substantially entirely placed between the outward facing surface of the inner glass sheet and the inward facing surface of the outer glass sheet, at least one reflective coating, in particular a heat and/or infrared reflective coating, said reflective coating provided on at least a portion of the inward facing surface of the outer glass sheet, and at least one ceramic band, stretching along at least a portion of the perimeter of the inward facing surface of the outer glass sheet. The invention is also related to a method for producing an automotive window laminate structure.