Launderable activated cotton garment
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Solution Overview
Problem
Current cotton processing techniques are environmentally damaging due to high water and energy consumption, and the use of strong alkali, which weakens cotton fibers and generates significant industrial water pollution.
Innovation Solution
A method involving the use of soda ash to treat cotton fabric at a lower temperature and pH, followed by hydrogen peroxide bleaching with a peroxide activator and arylesterase catalyst, and application of a wax lock to retain natural wax, reducing water usage and eliminating the need for strong alkali in the dyeing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If strong alkali is used to process cotton fabric, then the fabric is prepared for dyeing, but the cotton fiber strength decreases and environmental pollution increases
Solution Approach 1:
The patent changes the chemical parameters by using soda ash (sodium carbonate) instead of strong alkali (sodium hydroxide), and reduces the processing temperature from conventional high temperatures to below 150°F (66°C). This parameter change achieves fabric preparation for dyeing while preserving cotton fiber strength and reducing environmental pollution.
Solution Approach 2:
The patent uses hydrogen peroxide as a bleaching agent that decomposes into water and oxygen, replacing persistent strong alkali treatments. This disposable approach eliminates the need for extensive neutralization and reduces environmental pollution while maintaining fabric preparation effectiveness.
2Productivity
If conventional bleaching and dyeing processes are used, then the fabric is processed, but water consumption increases significantly
Solution Approach 1:
The patent combines the bleaching and dyeing processes into a single treatment step by applying reactive dye to the bleached fabric without intermediate rinsing or neutralization steps. This merging eliminates multiple water-intensive stages while maintaining processing efficiency.
Solution Approach 2:
The patent maintains continuous processing by keeping the fabric in a controlled aqueous environment throughout bleaching and dyeing, avoiding repeated wet-dry cycles. The reactive dye is applied directly to the bleached fabric, and the process continues without interruption until the final drying stage, significantly reducing water consumption.
3Reliability
If multiple drying cycles are applied, then the fabric is dried thoroughly, but energy consumption increases
Solution Approach 1:
The patent applies a preliminary sizing or anti-resoiling treatment to the fabric before the final drying step, which reduces the fabric's tendency to reabsorb moisture. This preliminary action allows for a single, lower-temperature drying cycle to achieve complete drying, reducing energy consumption while maintaining drying reliability.
4Ease of manufacture
If natural wax is removed from cotton fibers, then the fabric is easier to dye, but the fabric becomes more absorbent and loses water-resistant properties
Solution Approach 1:
The patent selectively removes only the surface impurities and prepares the fabric for dyeing through mild alkaline treatment with soda ash, while preserving the natural wax embedded within the cotton fiber structure. This selective extraction achieves dyeability without complete wax removal, maintaining water-resistant properties.
Solution Approach 2:
The patent creates different properties at different locations: the fabric surface is prepared for dye absorption while the internal fiber structure retains natural wax for water resistance. The mild processing conditions allow differential treatment where surface accessibility is improved without compromising internal wax content.
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 method decreases water consumption, maintains cotton fiber strength, and enhances the fabric's hydrophobic properties, allowing it to withstand multiple laundering cycles without wax removal, while reducing environmental impact.
Implementation Method 1
treating cotton fabric with soda ash at a temperature of less than about 150° F. (about 66° C.) and a pH of about 9.5
Implementation Method 2
bleaching the cotton fabric with hydrogen peroxide at a temperature of less than about 150° F. (about 66° C.)
Implementation Method 3
The hydrogen peroxide is neutralized, and the pH is lowered with an organic acid to between about 6 and about 7
Implementation Method 4
a wax lock is applied to the garment. The garment is dyed at a temperature of less than about 150° F. (about 66° C.), and dried
Data Source
AI summary
A method for making water-resistant cotton garments and the water-resistant cotton garments are provided. An exemplary method includes treating cotton fabric with soda ash at a temperature of less than about 150° F. (about 66° C.) and a pH of about 9.5 and bleaching the cotton fabric with hydrogen peroxide at a temperature of less than about 150° F. (about 66° C.). The hydrogen peroxide is neutralized, and the pH is lowered with an organic acid to between about 6 and about 7. A garment is made from the cotton fabric and a wax lock is applied to the garment. The garment is dyed at a temperature of less than about 150° F. (about 66° C.), and dried.