Multiple Layer Roofing Substrate with Non-Porous Bottom
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Solution Overview
Problem
Asphalt roofing materials require multiple layers of substrate with varying porosities to enhance waterproofing and impact resistance, but existing methods are inefficient in manufacturing and require additional asphalt application on both surfaces, increasing complexity and cost.
Innovation Solution
A multiple layer substrate system comprising a combination of polymer filament webs and fiberglass mats with entangled fibers, where different porosity layers are bonded using a bonding agent, allowing for efficient asphalt application only on the top surface and preventing water penetration through a non-porous bottom layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple layers of substrate with varying porosities are used to enhance waterproofing and impact resistance, then the reliability and strength of roofing materials are improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The substrate is divided into multiple distinct layers with different porosity characteristics. The top layer has higher porosity for asphalt absorption and bonding, while the bottom layer has lower porosity for waterproofing. This segmentation allows each layer to perform its specific function optimally, improving overall reliability without requiring a monolithic complex structure.
Solution Approach 2:
Different regions of the substrate are given different porosity properties tailored to their specific functions. The top surface region is made more porous to facilitate asphalt penetration and bonding, while the bottom region is made less porous to prevent water infiltration. This local differentiation of properties enhances waterproofing performance while maintaining manufacturing feasibility.
2Strength
If multiple layers of substrate with varying porosities are used to enhance impact resistance, then the strength of roofing materials is improved, but the device complexity increases
Solution Approach 1:
The substrate structure is segmented into multiple layers with varying porosity to provide graduated impact resistance. The higher porosity top layer absorbs initial impact energy through deformation, while the lower porosity bottom layer provides structural support and prevents catastrophic failure. This layered segmentation improves impact resistance more effectively than a uniform structure would.
Solution Approach 2:
The substrate combines different materials with complementary properties in a layered composite structure. The combination of high-porosity and low-porosity materials creates a composite system that leverages the advantages of each material type - the porous material for energy absorption and the less porous material for structural integrity - thereby improving strength while avoiding the complexity of a fully homogeneous complex material.
3Reliability
If additional asphalt is applied on both surfaces of substrate, then the waterproofing performance is improved, but the loss of substance and manufacturing cost increase
Solution Approach 1:
The waterproofing function is extracted from the asphalt coating and assigned to the low-porosity bottom layer of the substrate. This layer inherently prevents water infiltration due to its low porosity characteristics, eliminating the need for asphalt application on the bottom surface. Asphalt is applied only to the top surface where it is needed for bonding and weather protection, significantly reducing asphalt consumption while maintaining waterproofing performance.
Solution Approach 2:
Asphalt application is localized to only the top surface of the substrate where it is functionally required for UV protection, weathering resistance, and granule bonding. The bottom surface, which has intrinsic waterproofing capabilities due to its low porosity, receives no asphalt coating. This localized application strategy reduces material consumption while preserving essential waterproofing functions.
4Strength
If additional asphalt is applied on both surfaces of substrate, then the bonding performance is improved, but the manufacturing cost increases
Solution Approach 1:
The bonding function is extracted and concentrated at the top surface interface where asphalt is applied. The high-porosity top layer provides excellent asphalt absorption and mechanical interlocking, ensuring strong bonding without requiring bottom surface treatment. This extraction of bonding functionality to a single interface simplifies the manufacturing process by eliminating the need for dual-sided asphalt application and associated handling complexity.
Solution Approach 2:
The porosity parameter of the substrate layers is optimized to enhance asphalt bonding at the top surface. The high porosity of the top layer creates capillary action that draws asphalt into the matrix, improving mechanical adhesion. This parameter optimization achieves strong bonding performance with single-sided asphalt application, reducing manufacturing complexity compared to requiring asphalt on both surfaces.
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 approach simplifies the manufacturing process, reduces material costs by eliminating the need for additional asphalt on the bottom surface, and enhances the structural integrity and impact resistance of roofing materials.
Implementation Method 1
a bonding agent that bonds the first sheet and the second sheet to form the multiple layer sheet of substrate material
Implementation Method 2
a fiberglass mat having fiberglass threads that are entangled with the polymer filament web, the fiberglass mat being thermally bonded to the polymer filament web
Data Source
AI summary
Disclosed is a multiple layer substrate that can be used with a top asphalt applicator that eliminates the need for a bottom asphalt applicator and fines applied to the bottom asphalt layer. A low porosity or impermeable bottom layer prevents the flow of asphalt applied to the porous top layers of the substrate from penetrating the bottom surface. This eliminates the need for fines to prevent sticking of shingles in a shingle stack. In addition, substrate layers that combine fiberglass and polyester fibers in various configurations provide a substrate that can be used in typical shingle manufacturing and manufacturing of waterproofing products that is impact resistant.