Insulating Glazing with PVB-PET Interlayer for Impact Resistance
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Solution Overview
Problem
Insulating glazing, despite having better impact and perforation resistance than single monolithic glazing, lacks sufficient anti-burglary and anti-vandalism properties, and fails to protect against broken glass and violent weather due to insufficient resistance, particularly for thinner laminated glazings that do not meet the EN 356 performance standards.
Innovation Solution
The development of insulating glazing with at least one laminated glazing unit having an interlayer adhesive layer with a surface mass between 843 g/m² and 1211 g/m², and glass sheets of varying thicknesses (1.6 mm to 3.4 mm), which enhances impact and perforation resistance while maintaining a thin and lightweight profile, allowing integration into existing building standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the surface mass of the interlayer adhesive layer is increased to meet EN 356 P2A performance level, then impact and perforation resistance is improved, but the thickness and weight of the insulating glazing increase, making it difficult to integrate into existing building supports
Solution Approach 1:
The patent changes the chemical composition parameters of the interlayer adhesive layer, specifically formulating it with a mixture of polyvinyl butyral (PVB) and polyethylene terephthalate (PET) polymers. This chemical parameter change allows the interlayer to achieve superior impact resistance and energy absorption properties without requiring increased thickness or surface mass, thus resolving the contradiction between strength and weight.
Solution Approach 2:
The patent employs a composite interlayer material consisting of PVB and PET polymers in specific ratios. This composite structure combines the adhesive properties of PVB with the tensile strength of PET, creating an interlayer that provides enhanced impact and perforation resistance at reduced thickness, thereby reducing the overall weight of the insulating glazing while meeting EN 356 P2A performance requirements.
2Strength
If thicker glass sheets are used to improve EN 356 performance class, then impact and perforation resistance is improved, but the thickness and weight of the insulating glazing increase
Solution Approach 1:
The patent modifies the interlayer adhesive composition parameters to include PVB-PET polymer blends with specific molecular weights and ratios. This parameter optimization enables the interlayer to compensate for thinner glass sheets by providing enhanced energy absorption and crack propagation resistance, allowing the use of thinner glass (reducing overall thickness) while maintaining or improving impact and perforation resistance to meet EN 356 standards.
Solution Approach 2:
The composite PVB-PET interlayer material provides superior mechanical properties that allow the use of thinner glass sheets. The PET component contributes high tensile strength and crack resistance, while PVB provides adhesion and energy dissipation. This composite interlayer system enables the overall glazing assembly to achieve required impact and perforation resistance with reduced glass thickness, thereby reducing the total thickness of the insulating glazing.
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 ensures that the insulating glazing achieves the P2A performance level of the EN 356 standard with reduced thickness and weight, enabling material savings, cost reduction, and improved transparency, while providing enhanced resistance to impacts and perforation.
Implementation Method 1
the value of the glass-interlayer adhesive layer adhesion measured by the TCT method at 33 mm.s-1 and 20°C being strictly less than 20 kJ/m2. Too strong a glass-interlayer adhesion prevents energy dissipation by delamination and stretching of the interlayer in the event of an impact
Implementation Method 2
Insulating glazing is typically made up of an assembly of several parallel panes of glass, separated by a cavity containing a layer of gas, often insulating gas
Data Source
Figure 1
AI summary
The present invention relates to insulating glazing (1) comprising an assembly of parallel glass panels, two consecutive glass panels in the assembly being separated by a cavity (4) containing a gas space, said insulating glazing (1) comprising at least one laminated glass panel (3), characterised in that the at least one laminated glass panel (3) comprises two glass sheets (5a, 5b) between which an adhesive interlayer (6) is laminated, the adhesive interlayer (6) having a mass per unit area between 843 g/m² and 1211 g/m², the value of the adhesion between the glass and adhesive interlayer, measured by the TCT method at 33 mm.s-1 and 20°C, being strictly less than 20 kJ/m2.