Thin Pane Laminated Glass with Invisible Heating Coating
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Solution Overview
Problem
Current heatable laminated glasses for vehicles face challenges in reducing energy consumption while maintaining stability and breaking strength, particularly with thinner panes that are required for weight reduction and safety standards.
Innovation Solution
A laminated glass design featuring a thin inner pane (0.6-1.0 mm) and a thicker non-prestressed outer pane (0.7-1.4 mm) with an electrically heatable coating, where the inner pane is either chemically prestressed or made of aluminosilicate glass, and the thermoplastic intermediate layer is formed by a single thermoplastic film, such as PVB, to achieve reduced energy consumption and enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If pane thickness is reduced to reduce vehicle weight, then fuel consumption is reduced, but stability and break resistance deteriorate
Solution Approach 1:
The patent uses a laminated glass composite structure consisting of multiple glass panes (at least two, preferably three) with different thicknesses bonded together. The thinner panes (0.6-1.0 mm) provide weight reduction while the thicker pane (1.5-3.0 mm) provides structural strength and break resistance. The thermoplastic interlayer bonds these layers into a composite that meets safety requirements while reducing overall weight compared to conventional uniform thickness glass.
Solution Approach 2:
The patent applies different thicknesses to different regions of the glass assembly. Specifically, at least one glass pane has a thickness of 0.6-1.0 mm while another pane has a thickness of 1.5-3.0 mm. This local variation in thickness allows weight reduction in areas where less strength is needed while maintaining adequate strength in critical areas, resolving the contradiction between weight and strength.
2Power
If heating elements are made visible to ensure heating function, then heating performance is improved, but visibility and aesthetics deteriorate
Solution Approach 1:
The patent replaces traditional visible wire heating elements with an electrically conductive coating applied to the glass surface. This coating can be deposited as a thin, uniform layer using physical vapor deposition (PVD) or chemical vapor deposition (CVD) techniques, creating an invisible or barely visible heating element that maintains optical clarity while providing the necessary heating function.
Solution Approach 2:
The electrically conductive coating is designed to be optically transparent or have minimal coloration, allowing it to remain invisible or barely visible to observers. The coating materials and deposition parameters are controlled to ensure the heating element does not create unwanted visual effects while still providing effective heating performance.
3Use of energy by stationary object
If electrically conductive coating is applied to improve heating and infrared reflection, then heating performance and energy efficiency are improved, but manufacturing complexity increases
Solution Approach 1:
The electrically conductive coating serves multiple functions simultaneously: it provides heating capability when electrical current is applied, reflects infrared radiation to reduce solar heat gain, and can be integrated with the glass manufacturing process. This multi-functionality reduces the need for separate components and can actually simplify the overall system while improving energy efficiency.
Solution Approach 2:
The electrically conductive coating is applied during the glass manufacturing process, either by PVD or CVD methods, before the glass is cut or assembled into the final product. This preliminary application of the coating integrates the heating function into the base material itself, reducing the need for additional assembly steps and simplifying the overall manufacturing process despite the added functional complexity.
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 configuration achieves reduced energy consumption, high stability, and breaking resistance, meeting safety requirements with lower weight, thus suitable for vehicle glazing, and allows for efficient heating with minimal visibility impact.
Implementation Method 1
bonded together by a thermoplastic interlayer
Implementation Method 2
heating elements in the windshield should be invisible or barely visible... wire-shaped heated elements... infrared-reflecting, electrically conductive coating... good electrical conductivity, which enables the window to be heated
Data Source
Figure 1a~1b
Figure 2
AI summary
Disclosed is a laminated glass for a vehicle for separating the interior of a vehicle from an external environment, at least comprising: - an inner pane (1) consisting of glass and comprising an inner face (III) and an outer face (IV), - an outer pane (2) consisting of glass and comprising an inner face (II) and an outer face (I), - a thermoplastic intermediate layer (3) which connects the inner face (III) of the inner pane (1) to the inner face (II) of the outer pane (2), wherein - the thickness of the inner pane (1) is less than or equal to 1.4 mm, - the thickness of the outer pane (2) is less than or equal to 1.8 mm and - an electrically heatable coating (4) is applied to the inner face (III) of the inner pane (1) or the inner face (II) of the outer pane (2).