Transparent Spacers for Fire-Resistant Glazing
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Solution Overview
Problem
Fire-resistant glazing systems with multiple panes face challenges in maintaining uniform light transmission and aesthetics due to the presence of opaque spacers, which obstruct light and compromise fire resistance, especially during thermal stresses.
Innovation Solution
The use of essentially transparent spacers made from materials like polycarbonates, poly-methacrylates, and polyesters, which allow at least 50% light transmission and are resistant to compression and chemical contact, along with a transparent silicone resin seal, to minimize the presence of opaque elements and maintain fire resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional opaque spacers are used to secure adjacent panes of glass, then the structural integrity and fire resistance are maintained, but the light transmission and aesthetic uniformity are compromised
Solution Approach 1:
The spacer material parameters are changed from traditional opaque materials to transparent materials such as polycarbonates, poly-methacrylates, and polyesters that allow at least 50% light transmission while maintaining the mechanical and thermal properties required for fire resistance
Solution Approach 2:
The invention uses composite construction with transparent spacer materials combined with intumescent material layers that expand under heat to maintain fire resistance, creating a multi-layer system where each component contributes specific properties
2Illumination intensity
If transparent spacer materials are used to improve light transmission, then the aesthetic uniformity is enhanced, but the resistance to compression and chemical contact may be compromised
Solution Approach 1:
The invention selects transparent materials with specific parameter ranges - polycarbonates, poly-methacrylates, and polyesters - that possess both the required optical properties (≥50% light transmission) and mechanical strength to withstand compression loads during installation and service
Solution Approach 2:
The spacer materials are applied specifically at the edges and junctions where compression forces are concentrated, while the central glass areas maintain full transparency, optimizing both structural and aesthetic properties in different locations
3Reliability
If the intumescent material layers are increased in thickness to improve fire resistance, then the fire performance is enhanced, but the weight and complexity of the glazing system increase
Solution Approach 1:
The invention optimizes the thickness parameter of intumescent material layers to achieve the required fire resistance rating (minimum 30 minutes) while minimizing weight, using layers between the glass panes rather than adding external protective layers
Solution Approach 2:
The intumescent material layers are nested between the glass panes and transparent spacers, creating a compact multi-layer structure where the fire protective layers are integrated within the overall glazing assembly rather than adding external bulk
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 ensures better uniformity in light transmission and aesthetics while maintaining the fire-resistant properties of the glazing system, even under thermal stresses, by reducing the visibility of spacers and preventing defects like bubbles and veiling, thus enhancing the overall performance and appearance of the glazing.
Implementation Method 1
Fire-resistant glazing comprising an intumescent material based on hydrated alkali silicates sandwiched between sheets of glass
Implementation Method 2
essentially transparent spacers made from materials like polycarbonates, poly-methacrylates, and polyesters, which allow at least 50% light transmission
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a glazed wall (5) comprising at least two glass panes (1-4) disposed edge to edge, said glass panes being fire resistant and each comprising two glass sheets (7, 8) with an intumescent material (9) comprising hydrated alkali silicate being disposed therebetween. The two glass sheets are connected peripherally by a group of spacer elements (10) delimiting between the two sheets a space into which a liquid composition of alkali silicate is poured so as to fill the space, said composition being selected to form a solid gel, the solidification being optionally accelerated by means of an increase in temperature or exposure to UV or IR radiation. The elements delimiting the space are impervious to the liquid silicate composition, said elements comprising, at least on the edges of adjacent panes, rigid or semi-rigid spacer elements (10) made from a material that is essentially transparent to visible light.