Sulfite-Based Reducing Agent for Unshrinking Wool Fabrics
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Solution Overview
Problem
Wool and animal hair-based fabrics tend to shrink when exposed to water or unsuitable laundering methods, leading to accidental shrinkage despite pre-treatment efforts for shrink-resistance.
Innovation Solution
A method involving a sulfite-based reducing agent to dissolve disulfide bonds in shrunken materials, followed by physical stretching and rinsing to allow reformation of bonds, effectively unshrinking the fabric without damaging it or affecting dye washfastness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wool garments are exposed to water or laundered, then they become clean and wearable, but they shrink in size
Solution Approach 1:
The patent applies preliminary action by treating wool garments with a reducing agent solution before laundering to break disulfide bonds in advance, preventing shrinkage during the cleaning process. The method involves soaking the garment in the solution for a specific time prior to washing, which prepares the fiber structure to resist shrinkage forces that will occur during laundering.
Solution Approach 2:
The patent utilizes parameter changes by altering the chemical state of disulfide bonds in wool fibers through reduction. The reducing agent changes the bond configuration from cross-linked to broken state, fundamentally changing the physical properties of the wool to prevent shrinkage while maintaining cleanability.
2Reliability
If pre-treatment is applied to resist shrinkage, then shrink-resistance improves, but accidental shrinkage still occurs frequently
Solution Approach 1:
The patent fundamentally changes the chemical parameter of wool fibers by breaking disulfide bonds with a reducing agent, transforming the fiber's structural stability. This parameter change makes the wool resistant to the harmful shrinkage effect that normally occurs during laundering, achieving reliable shrink-resistance that prevents accidental shrinkage.
3Length of moving object
If chemical treatments are used to unshrink garments, then garment size increases, but fiber damage may occur
Solution Approach 1:
The patent applies controlled parameter changes by using a mild reducing agent solution at specific concentrations and exposure times to break disulfide bonds reversibly. This controlled chemical parameter change allows the garment to expand to the desired size while maintaining fiber strength and integrity, avoiding permanent damage.
Solution Approach 2:
The reducing agent solution acts as an intermediary that mediates between the applied mechanical stress and the wool fiber structure. It facilitates safe bond breaking and reforming during the unshrinking process, protecting the fiber from direct mechanical damage while achieving size increase.
4Length of moving object
If disulfide bonds are dissolved and reformed during unshrinking, then garment size increases, but dye washfastness may be affected
Solution Approach 1:
The patent carefully controls the chemical parameters of the reducing agent treatment to selectively affect disulfide bonds without impacting dye-molecule interactions. By adjusting concentration, temperature, and exposure time, the method changes the fiber structure for unshrinking while preserving dye fastness properties.
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 method safely and effectively increases the size of shrunken wool garments by up to 125% of their original size without damaging the fibers or impacting dye washfastness, and can be performed without protective equipment or leaving residues.
Implementation Method 1
dissolving disulfide bonds in the shrunken material
Implementation Method 2
promoting reformation of disulfide bonds in the shrunken material
Data Source
AI summary
Chemical compositions and techniques for treating wool (and other animal hair-based) fabrics are provided. In particular, compositions and techniques for unshrinking wool fabrics and garments are provided.