Aircraft Safety Glazing Adhesion Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current safety glazing solutions for transport vehicles, particularly airborne, face challenges in maintaining high optical quality transparency while ensuring resistance to penetration, energy absorption, anti-laceration, and anti-scratch properties, especially under variable conditions such as bird strikes, with inadequate adhesion between the polyester film and polyvinyl butyral layer.
Innovation Solution
A safety glazing system comprising a glass substrate and a complex sheet of plastic material with a thermoplastic polyurethane adhesive layer between the glass and polyvinyl butyral, ensuring an adhesion of at least 3 daN/cm for the polyester film to polyvinyl butyral, which enhances shock resistance and maintains anti-penetration and anti-splinter properties across a wide range of temperatures and humidity conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the adhesion of polyester film to polyvinyl butyral layer is increased to improve shock resistance, then the resistance to penetration and energy absorption improve, but the polyester film may break during bird strike causing loss of anti-splinter properties
Solution Approach 1:
The patent optimizes the adhesion parameter to a specific range (3-8 daN/cm) rather than maximizing it. This parameter change resolves the contradiction by finding the optimal adhesion strength that provides sufficient shock resistance while preventing polyester film breakage during bird strikes.
2Reliability
If a complex sheet structure with multiple layers is used to improve anti-penetration and energy absorption, then the safety performance improves, but the manufacturing complexity and device complexity increase
Solution Approach 1:
The patent combines multiple functions into a single complex sheet structure that integrates polyester film, polyvinyl butyral layer, and scratch-resistant coating. This merging approach achieves improved anti-penetration and energy absorption properties while simplifying the overall glazing system compared to using separate components.
Solution Approach 2:
The patent uses composite material structure with polyester film and polyvinyl butyral layer bonded together. This composite approach provides superior mechanical properties including energy absorption and anti-penetration capabilities while maintaining a manageable structural complexity.
3Reliability
If the glazing uses thermoplastic polyurethane adhesive layer to maintain adhesion under variable temperature and humidity conditions, then the reliability under environmental stress improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies precise parameters for the thermoplastic polyurethane adhesive layer including thickness (0.1-6mm) and adhesion strength (3-8 daN/cm). These parameter specifications ensure reliable adhesion performance across variable temperature and humidity conditions while providing clear manufacturing guidelines to control precision requirements.
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 improved adhesion and energy absorption capabilities of the glazing system provide enhanced resistance to bird strikes and maintain optical clarity, ensuring better durability and safety performance, even at low temperatures and under varying environmental conditions.
Implementation Method 1
an adhesive layer of thermoplastic polyurethane being interposed between the glass substrate and the layer of polyvinyl butyral
Implementation Method 2
properties of resistance to penetration, energy absorption (as produced by an impact)
Data Source
AI summary
The invention relates to a glass panel including a glass substrate and a complex sheet made of plastic material and including a layer of plasticised polyvinyl butyral and a film of polyester provided with a coating that is resistant to scratches and abrasions, an adhesive layer of thermoplastic polyurethane being inserted between the glass substrate and the polyvinyl butyral layer of the complex sheet made of plastic material, characterised in that the adhesion of the polyester film to the layer of polyvinyl butyral, measured by exerting, onto a 1 cm wide strip of the polyester film, tensile stress perpendicular to the surface of the glass panel at a tensile speed of 5 cm/min, is at least 3 daN/cm. The invention also relates to the use of such a glass panel for a vehicle, in particular for air transport.