Decolorization method of polyester fabric
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Solution Overview
Problem
Current decolorization methods for polyester fabrics require excessive solvent usage and result in a color cast phenomenon, leading to high solvent recycling costs and inefficient dye removal.
Innovation Solution
A decolorization method involving a first extraction treatment with a recycled solvent followed by a second extraction treatment with a fresh solvent, reducing solvent usage and minimizing color cast by reusing the recycled solvent across multiple batches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple extractions are performed with a large amount of solvent to remove dyes from polyester fabric, then the dye removal efficiency is improved, but the solvent consumption increases significantly and color cast phenomenon occurs
Solution Approach 1:
The patent implements a solvent recovery system where used solvent is collected after extraction, filtered to remove dye residues, and then reused in subsequent extraction cycles. This principle directly addresses the contradiction by recovering and reusing the solvent instead of discarding it, significantly reducing solvent consumption while maintaining effective dye removal through multiple cycles
Solution Approach 2:
The patent establishes a continuous extraction process where solvent is circulated through the polyester fabric multiple times in sequence. The same solvent performs extraction repeatedly after filtration, creating a continuous useful action that removes dye effectively without requiring large amounts of fresh solvent for each extraction cycle
2Manufacturing precision
If a large amount of solvent is used for dye extraction, then the dye removal efficiency is improved, but the cost of solvent purification and recycling increases
Solution Approach 1:
By implementing solvent recovery and reuse, the patent eliminates the need for continuous solvent purification and recycling. The filtered solvent is reused multiple times, dramatically reducing the energy and cost associated with solvent purification processes while maintaining effective dye removal
3Manufacturing precision
If traditional extraction methods are used to remove dyes, then the dye removal efficiency is improved, but the color cast phenomenon persists in the decolored fabric
Solution Approach 1:
The patent divides the dye removal process into multiple sequential extraction cycles using the same recovered solvent. Each cycle progressively removes different components of the dye, preventing the accumulation of color casts that occur in single-step extraction methods. The segmented approach allows for more complete and uniform dye removal
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 significantly reduces solvent consumption, lowers decolorization costs, and achieves stable fabric color with minimal color cast, allowing for efficient dye removal and improved solvent reuse.
Implementation Method 1
a first extraction treatment is performed on the polyester fabric using a recycled solvent, so that a first portion of a dye in the polyester fabric moves into the recycled solvent
Data Source
AI summary
A decolorization method of a polyester fabric, including the following steps, is provided. A first extraction treatment is performed on the polyester fabric using a recycled solvent, so that a first portion of a dye in the polyester fabric moves into the recycled solvent. A first filtering treatment is performed on the recycled solvent and the polyester fabric to obtain a treated polyester fabric. A second extraction treatment is performed on the treated polyester fabric using a fresh solvent, so that a second portion of the dye in the treated polyester fabric moves into the fresh solvent. A second filtering treatment is performed to obtain a decolored polyester fabric and the recycled solvent.