Rip-Stop Fabric with Mechanical Stretch Fibers for Uniform Durability
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Solution Overview
Problem
Rip-stop fabrics used for police and military uniforms lack stretch properties due to the degradation of spandex fibers when used with high polyester content and exposed to dyeing and stain repellent finishes, limiting their durability and comfort.
Innovation Solution
Incorporating mechanical stretch fibers, such as multi-component polyester yarns or elasterell-p fibers, which provide inherent stretch properties and withstand high dyeing and finishing temperatures, eliminating the need for spandex and enhancing fabric durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If spandex fibers are used to add stretch to rip-stop fabrics, then comfort is improved, but the fabric durability deteriorates due to fiber degradation during dyeing and finishing processes
Solution Approach 1:
The patent changes the material parameter from spandex to mechanical stretch fibers that can withstand high temperatures. The mechanical stretch fibers maintain stretch functionality while resisting degradation during dyeing and finishing processes, thus preserving fabric durability through parameter substitution.
Solution Approach 2:
The patent replaces the fragile spandex fiber with a more robust mechanical stretch fiber that does not require replacement or special care. The new fiber system is designed to survive the full lifecycle of the uniform including multiple dyeing and finishing cycles, eliminating the need for premature replacement.
2Ease of operation
If spandex fibers are used in high polyester content fabrics, then stretch properties are achieved, but the stretch functionality deteriorates due to spandex degradation during washing cycles
Solution Approach 1:
The patent changes the fiber material parameter from spandex to mechanical stretch fiber that is resistant to washing cycle degradation. This parameter change allows the fabric to maintain stretch properties throughout the entire usable life of the uniform, even after extensive washing cycles.
Solution Approach 2:
The patent substitutes the elastomeric mechanical system (spandex) with a mechanical stretch fiber system that operates through different physical mechanisms. The mechanical stretch fibers provide stretch through structural design rather than elastomeric recovery, making them resistant to degradation from washing cycles.
3Reliability
If stain repellent finishes are applied to enhance durability, then fabric protection is improved, but spandex fibers further degrade due to heat-setting during finishing
Solution Approach 1:
The patent changes the fiber material parameter to mechanical stretch fiber that can withstand the heat-setting temperatures required for applying stain repellent finishes. This parameter change allows both fabric protection and stretch functionality to coexist without mutual degradation.
Data Source
AI summary
Rip-stop pants include waist and leg portions formed of ripstop fabric having synthetic mechanical-stretch filament yarns interwoven into spun, staple yarns in a ripstop pattern.