Laminated Glazing with Dye Interlayer for Infrared Reflection
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Solution Overview
Problem
Current laminated glazing solutions for vehicles are expensive due to the use of bulk-tinted glass or PVB, and they often result in an undesirable color appearance when reflecting solar radiation, failing to achieve a suitable compromise between thermal energy reflection and light transmission while maintaining neutrality in appearance.
Innovation Solution
A laminated glazing structure comprising clear glass sheets bonded with an interlayer that includes a polymer compound or varnish with a dye absorbing visible light but being transparent to infrared radiation, combined with a stack of silver-based layers for infrared reflection, without using bulk-tinted glass or PVB, allowing for adjustable light transmission and neutral color appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If bulk-tinted glass or PVB is used to reduce solar radiation transmission, then thermal energy reflection is improved, but the appearance becomes colored and expensive
Solution Approach 1:
The invention segments the solar spectrum treatment by using separate functional layers: a first thin sheet with dye for visible light absorption and a stack of silver-based layers for infrared reflection. This segmentation allows each layer to specialize in one wavelength range, achieving both visible tinting and infrared reflection without requiring expensive bulk-tinted materials.
Solution Approach 2:
The invention uses composite material structure combining a polymer compound or varnish with dye in the first thin sheet, and a stack of silver-based layers. This composite approach integrates the optical functions of different materials (dye for visible absorption, silver for infrared reflection) in a layered configuration, achieving superior performance compared to homogeneous bulk-tinted materials.
2Loss of energy
If a stack of silver-based layers is used for infrared reflection, then thermal energy control is improved, but the glazing shows pronounced coloration and reddish appearance in reflection
Solution Approach 1:
The first thin sheet with dye acts as an intermediary layer between the incident solar radiation and the silver-based stack. It absorbs visible light before it reaches the silver layers, preventing the silver from imparting its characteristic reddish color to the reflected light. This intermediary layer mediates the optical interaction, allowing the silver stack to perform infrared reflection without aesthetic drawbacks.
3Temperature
If tinted glass or interlayer is used to block solar radiation, then heating is reduced, but light transmission for visual comfort is compromised
Solution Approach 1:
The invention applies local quality by making different parts of the glazing system have different optical properties: the first thin sheet with dye provides selective absorption in the visible range for aesthetic tinting, while the silver-based stack provides selective reflection in the infrared range for thermal control. This local differentiation of optical functions allows independent optimization of visible light transmission and infrared reflection.
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 provides a cost-effective, neutral-colored laminated glazing that effectively controls solar radiation, maintaining interior comfort and aesthetic appeal by absorbing visible light while reflecting infrared radiation, thus reducing heating and ensuring sufficient light transmission.
Implementation Method 1
a first thin sheet comprising or consisting of a layer of a polymer compound or of a varnish, said polymer compound or said varnish comprising a dye, said dye absorbing substantially all of the light within the visible region between 380 and 780 nm and being substantially transparent to infrared radiation
Implementation Method 2
a stack of layers reflecting infrared radiation between 780 nm and 2500 nm
Data Source
AI summary
A laminated glazing includes an outer sheet of clear glass and an inner sheet of clear glass, which are joined to one another by an interlayer of plastic, includes the succession of the following elements, from the inside to the outside of the glazing: the inner sheet of clear glass, a stack of layers reflecting infrared radiation between 780 nm and 2500 nm, the interlayer including successively a) a first thin sheet including a layer of a polymer compound or of a varnish, the polymer compound or the varnish including a dye, the dye absorbing substantially all of the light within the visible region and being substantially transparent to the infrared, b) a second thin sheet of an untinted plastic, the outer sheet of clear glass.