Simulated Denim Garment Using Dyeable and Non-Dyeable Yarn Blends
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Solution Overview
Problem
The conventional indigo dyeing process for denim fabrics is costly, environmentally harmful due to high water usage and pollution, and requires expensive equipment, limiting its accessibility and scalability.
Innovation Solution
A method involving the use of a combination of dyeable and undyeable yarns, where only the dyeable cotton yarns absorb reduced liquid indigo dye or other blue dyes, mimicking the appearance of conventionally dyed denim without the need for expensive indigo dye ranges, using existing knitting or weaving machines and dye systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional indigo dyeing process is used, then denim fabric achieves authentic blue color and fading characteristics, but manufacturing cost increases and equipment complexity increases
Solution Approach 1:
The patent uses a blend of natural white fibers (cotton, hemp, linen) and synthetic white fibers (polyester, polypropylene, nylon) that, when dyed with indigo, replicates the appearance and fading characteristics of traditional denim. The synthetic fibers are engineered to resist dye penetration, creating the characteristic white speckles and fade patterns without requiring complex indigo dye range equipment
Solution Approach 2:
The fabric is constructed as a composite material system combining natural cellulose fibers that absorb indigo dye with synthetic polymer fibers that resist dyeing. This composite structure enables the fabric to achieve authentic denim aesthetics through the interaction of differently responsive materials, eliminating the need for specialized dyeing equipment
2Reliability
If conventional indigo dyeing process is used, then denim fabric achieves desired color and fading effect, but water usage increases and pollution increases
Solution Approach 1:
The fabric replicates the visual appearance and fading behavior of conventionally dyed denim through the differential dye absorption of natural and synthetic fibers, achieving the same aesthetic result without the environmental burden of traditional indigo dyeing processes
Solution Approach 2:
The patent modifies the fiber composition parameters to include a specific ratio of natural to synthetic fibers (e.g., 50-50, 70-30, or 30-70 blends), where the synthetic fiber content controls dye absorption characteristics, enabling color fastness and fading effects without requiring the harsh chemical reductions and large water volumes of conventional indigo dyeing
3Reliability
If conventional indigo dyeing process is used, then denim fabric achieves blue color, but manufacturing cost increases
Solution Approach 1:
The use of synthetic fibers blended with natural fibers reduces manufacturing cost by eliminating the need for expensive indigo dye range equipment while maintaining the characteristic blue color and fade effects through differential dye absorption of the composite material system
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 significantly reduces water and pollutant usage, eliminates the need for specialized equipment, and allows for cost-effective production of denim-like fabrics globally, enabling flexible manufacturing and reduced inventory requirements.
Implementation Method 1
When exposed to reduced liquid indigo dye or other cotton or cellulosic dye using conventional dye machines, 50% of the yarn (cotton) will absorb these dyes. The 50% polypropylene or undyeable portion will remain white.
Implementation Method 2
Indigo Dye is not water soluble and must be reduced with toxic chemicals before it can be used to dye the cotton warp portion of the denim fabric
Data Source
AI summary
A method of making a simulated denim garment which comprises constructing a woven garment using dyeable warp yarns and non-dyeable weft yarns and dying the thus-constructed garment using a reduced liquid indigo dye or cotton dye. Cotton is a preferred warp yarn. Dyeable and non-dyeable materials may also be spun together to form a yarn, which can be dyed either in a yarn form or as constructed into a knitted garment.