Roofing material and related method
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Solution Overview
Problem
Existing roofing materials require fiberglass strands and a pad finish for dimensional stability, adding complexity and cost to the manufacturing process.
Innovation Solution
A roofing material with a stitch-bonded fabric base sheet using a blend of standard and bi-component polyester staple fibers, which provides dimensional stability through heat-activated fusion junctions without the need for fiberglass strands or a pad finish.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If fiberglass strands and pad finish are applied to the base sheet, then dimensional stability is achieved, but manufacturing complexity and cost increase
Solution Approach 1:
The invention removes the fiberglass strands and pad finish from the base sheet construction. The base sheet is made solely from entangled polyester staple fibers without any glass reinforcement or surface finishing, thereby eliminating the complexity and cost associated with these additional components while maintaining dimensional stability through the entangled fiber structure alone.
Solution Approach 2:
The invention changes the material parameters by using 100% polyester staple fibers with specific length ranges (1-4 inches) and controlling the entanglement density through needle-punching parameters. This parameter optimization allows the base sheet to achieve dimensional stability without requiring fiberglass strands or pad finish, resolving the contradiction between simplicity and stability.
2Stability of the object's composition
If fiberglass strands are used to carry tension load, then width dimension stability is maintained, but the base sheet loses stretch capacity
Solution Approach 1:
The invention optimizes the fiber length parameter (1-4 inches) and entanglement density to create a base sheet that maintains dimensional stability while preserving stretch capacity. The polyester staple fibers are long enough to provide structural integrity but short enough to allow the fabric to stretch and conform during roofing installation, eliminating the need for rigid fiberglass reinforcement.
Solution Approach 2:
The invention uses a composite structure of entangled polyester staple fibers that combines the properties of rigidity and flexibility. The random entanglement pattern creates a network that resists dimensional change while allowing controlled stretching, replacing the need for separate fiberglass strands and achieving both width stability and stretch capacity simultaneously.
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 achieves dimensional stability and processing ease by utilizing stitch-bonded fibers, reducing manufacturing complexity and cost while maintaining tensile strength and stretchability.
Implementation Method 1
The bicomponent fibers may be heat activated and cooled prior to application of the bitumen coating to form fusion junctions with the standard polyester staple fibers thereby providing dimensional stability
Implementation Method 2
In a typical roofing operation, bitumen is heated up to a temperature of approximately 200 C or more and is coated or poured onto a surface to be covered
Data Source
AI summary
A roofing material including a bitumen or other hot melt coating disposed across a base sheet of stitch-bonded fabric incorporating a blend of standard and bi- component polyester staple fibers stitch-bonded with a plurality of parallel stitch lines of stitching yarn running in the machine direction. The bicomponent fibers may be heat activated and cooled prior to application of the hot melt coating thereby providing dimensional stability.