UV-Resistant Bituminous Membrane With Surface Veil Reinforcement
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Solution Overview
Problem
Waterproofing membranes based on bitumen and SBS elastomeric polymer are sensitive to UV radiation, leading to microcracks and reduced durability, requiring additional protective layers that increase weight and hinder installation and rainwater evacuation.
Innovation Solution
A bituminous waterproofing membrane with a continuous layer of bitumen-SBS elastomeric polymer mixture and a thin, openwork veil of UV-resistant fibers or filaments embedded in the bituminous composition, located near the visible surface, which prevents fissure formation and allows partial overlap and heating-based installation without additional protective layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thin veil of UV-resistant filaments or fibers is embedded in the bituminous composition near the visible surface, then UV resistance and aesthetic appearance are improved, but the complexity of the membrane structure increases
Solution Approach 1:
The membrane combines bituminous composition with a thin veil of UV-resistant filaments or fibers to create a composite structure that provides both waterproofing and UV protection. This composite approach integrates two functional materials (bitumen for waterproofing and UV-resistant fibers for protection) into a single unified product, resolving the contradiction between reliability and structural complexity.
Solution Approach 2:
The UV-resistant veil is strategically positioned only near the visible surface of the membrane where UV exposure occurs, rather than throughout the entire membrane structure. This localized application provides UV protection where needed while minimizing the overall complexity and material usage of the membrane system.
2Reliability
If additional protective layers are added to protect from UV radiation, then UV resistance is improved, but weight increases and installation becomes more difficult
Solution Approach 1:
The invention merges the UV protection function with the membrane structure itself by embedding the UV-resistant veil within the bituminous composition. This integration eliminates the need for separate additional protective layers, thereby maintaining UV resistance while avoiding the weight increase and installation complexity that would result from adding separate protective membranes or coatings.
3Reliability
If a thin veil is embedded in the bituminous composition, then UV resistance is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The UV-resistant veil is incorporated into the membrane structure during the manufacturing process, before the membrane is installed. This preliminary integration of the protective layer simplifies the overall manufacturing workflow by combining multiple functions (waterproofing and UV protection) into a single production process, rather than requiring separate steps for applying protective layers later.
4Reliability
If additional protective layers are added for UV protection, then UV resistance is improved, but installation time and complexity increase
Solution Approach 1:
By combining UV protection and waterproofing into a single integrated membrane product, the installation process requires only one layer to be applied and secured. This eliminates the time-consuming sequential installation of multiple separate layers (waterproofing membrane followed by protective layer), thereby reducing installation time and simplifying the installation process while maintaining UV resistance.
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 membrane achieves enhanced UV resistance, durability, and aesthetic appearance while maintaining ease of installation and preventing water blockage, without compromising joint performance or increasing weight or cost.
Implementation Method 1
SBS elastomeric polymers have many advantageous properties, namely: high elasticity, high durability
Implementation Method 2
said at least one ply consists of a thin veil, with an openwork structure, without preferential direction of resistance to stresses and formed of filaments and/or fibers made of a material preferably resistant to U.V.
Implementation Method 3
good workability and good resistance over time, both from the sealing point of view and from the visual aspect, while advantageously allowing installation with partial lateral overlap and fastening by heating
Data Source
Figure 1~6
AI summary
The subject of the present invention is a UV-resistant waterproofing membrane consisting essentially of a mass of at least one bituminous composition, formed into at least one continuous layer, and of at least one sheet of filamentous or fibrous material, embedded in said mass. Membrane characterized in that the bituminous composition at least present consists of a bituminous mixture essentially based on bitumen, SBS elastomeric polymer and mineral fillers and in that said at least one sheet (3) consists of a fine veil, with a structure openwork, without preferential direction of resistance to stress and formed of filaments and/or fibers in a material preferably resistant to UV, said web (3) being embedded in the mass (2) of bituminous composition(s) in being located near the face (4) intended to be visible or exposed, after installation of said membrane (1).