Hot-Melt Backed Roofing Material for Lower Weight and Tear Strength
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Solution Overview
Problem
Traditional roofing materials are heavy due to their asphalt backing, leading to increased transportation costs and raw material expenses, and they lack sufficient tear strength.
Innovation Solution
The use of a hot melt material, such as pigmented polyethylene, is applied to one side of a substrate instead of asphalt on the back, with asphalt and granules on the other side, resulting in a lighter and more tear-resistant roofing material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If traditional asphalt material and finely ground mineral material are used to coat the back of roofing shingles, then adhesion and protection are provided, but the weight of the roofing material increases
Solution Approach 1:
The patent changes the physical and chemical parameters of the coating material by replacing traditional asphalt with hot melt adhesive compositions having specific viscosity ranges (100-10,000 cP at application temperature) and molecular weight characteristics. This parameter change enables the adhesive to provide adequate bonding strength while using less material, thereby reducing weight while maintaining adhesion and protection
Solution Approach 2:
The patent uses composite materials by combining hot melt adhesive with specific proportions of fillers (5-50 parts per 100 parts adhesive) such as calcium carbonate, talc, or mica. This composite approach provides the necessary mechanical strength and adhesion properties while the filler content can be optimized to reduce overall material density and weight compared to traditional asphalt coatings
2Reliability
If traditional asphalt material is used to coat the back of roofing shingles, then adhesion is provided, but the raw material cost increases
Solution Approach 1:
The patent changes the chemical composition parameters by replacing asphalt with hot melt adhesives based on polymers such as polyethylene, polypropylene, or polyester. These alternative materials have different cost structures and can be formulated to provide equivalent or superior adhesion at lower material costs, directly addressing the raw material cost issue while maintaining bonding reliability
Solution Approach 2:
The patent enables the use of recycled polymer materials as the base for hot melt adhesives. By discarding post-consumer or post-industrial plastic waste and recovering it as a valuable adhesive resource, the patent reduces raw material costs while providing sustainable alternatives to virgin asphalt, maintaining adhesion performance through proper formulation
3Strength
If traditional asphalt backing is used in roofing material, then the material has sufficient tear strength, but the transportation cost increases
Solution Approach 1:
The patent changes the mechanical properties parameters of the backing material by using hot melt adhesives with specific viscosity and molecular weight characteristics that provide enhanced tear resistance. The adhesive formulation includes polymers with high tensile strength and elongation properties, allowing the backing to resist tearing while using thinner application layers, thereby reducing weight while maintaining or improving tear strength
Solution Approach 2:
The patent employs composite materials by incorporating reinforcing fillers and fibers into the hot melt adhesive matrix. This composite structure provides tear strength through the reinforcement elements while the adhesive binder holds them together, achieving high tear resistance with lower overall material density and weight compared to solid asphalt backing
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 reduces the weight and enhances the tear strength of roofing materials, making them more cost-effective and efficient to transport while maintaining performance.
Implementation Method 1
a hot melt material which is preferably extruded on to one side of the substrate and which seals the substrate
Implementation Method 2
The hot melt material may be any material that may be extruded from a sheet die and/or melted into a curtain
Implementation Method 3
an asphalt material coating the other side of the substrate
Data Source
AI summary
Roofing material consists essentially of a substrate, a hot melt material applied to one side of the substrate, an asphalt material coating the other side of the substrate and roofing granules disposed on said asphalt material coated on the substrate. The hot melt material may be polyethylene, polyethylene-vinyl acetate, polypropylene, polyvinylidene chloride, polyester, nylon and mixtures thereof. The asphalt material may include non-asphaltic filler.