Pants with rip-stop and mechanical stretch
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Solution Overview
Problem
Rip-stop fabrics used for police and military uniforms face challenges in maintaining stretch properties due to degradation of spandex fibers at high dyeing temperatures and during extensive washing cycles, especially when polyester content exceeds 40%, leading to a lack of stretch in current polyester/cotton or nylon/cotton blends.
Innovation Solution
Incorporating mechanical stretch fibers, specifically multi-component polyester filament yarns like elasterell-p, which provide durability and withstand high temperatures, replacing traditional elastic fibers like spandex, and interweaving them with cellulose-based staple fibers in a rip-stop weave pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If spandex fibers are used to add stretch to polyester/cotton or nylon/cotton blends, then comfort is improved, but the stretch properties degrade during high-temperature dyeing and washing processes
Solution Approach 1:
The patent changes the material parameter from organic elastic fibers (spandex) to inorganic mechanical stretch fibers (steel wire), which have different thermal and chemical stability characteristics that resist degradation during high-temperature dyeing and washing processes
Solution Approach 2:
The patent creates a composite fabric structure by integrating mechanical stretch fibers (steel wire) with traditional textile fibers (polyester, cotton, or nylon) in a blended yarn system, combining the durability of inorganic materials with the comfort of natural/synthetic fiber blends
2Ease of operation
If spandex fibers are used to provide stretch, then comfort is enhanced, but the usable life of the fabric is reduced due to degradation during extensive washing cycles
Solution Approach 1:
The patent changes the material composition parameter from organic elastic fibers to inorganic mechanical stretch fibers, which exhibit superior resistance to hydrolysis and oxidation during repeated washing cycles, thereby extending fabric usable life
Solution Approach 2:
The patent replaces expensive, short-lived organic elastic fibers with more durable, cost-effective inorganic mechanical stretch fibers that maintain their properties through extensive washing, effectively creating a long-lasting solution
3Strength
If polyester content is increased above 40% to improve durability and ease of care, then fabric strength is improved, but spandex fiber degradation is accelerated during the dyeing process
Solution Approach 1:
The patent changes the fiber type parameter from heat-sensitive organic elastic fibers to heat-resistant inorganic mechanical stretch fibers, enabling the fabric to withstand high-temperature dyeing processes required for polyester blends without fiber degradation
Solution Approach 2:
The patent develops a composite yarn system combining polyester or nylon with mechanical stretch fibers, creating a multi-material structure that leverages the strength of synthetic fibers while incorporating the thermal stability of inorganic materials
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 resulting fabric offers enhanced durability and comfort with mechanical stretch properties, capable of withstanding multiple washes and high-temperature finishing processes, ensuring long-lasting performance for police and military uniforms.
Implementation Method 1
the second yarn is a filament multi-component polyester yarn or elasterell-p multi-component filament yarn
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.