Indigo Dyeing Line With Inert Compartments for Uniform Warp Shades
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Solution Overview
Problem
Continuous indigo dyeing processes are inefficient due to high consumption of hydrosulfite and soda, leading to increased salinity and pollution, and are heavily dependent on external variables and operator skill, with challenges in maintaining consistent dye bath conditions and achieving uniform color shades.
Innovation Solution
A hermetically sealed dyeing device with inert compartments for direct heating and dehydration of yarn, reducing oxidation and allowing high concentration dye baths, which minimizes hydrosulfite and soda usage and optimizes dye diffusion and fixation, independent of external variables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If traditional continuous indigo dyeing is performed with open tanks and air oxidation, then the dyeing process can be completed, but high consumption of hydrosulfite and soda occurs leading to increased salinity and pollution
Solution Approach 1:
The patent applies an inert atmosphere (nitrogen or carbon dioxide) in the dyeing compartment to prevent oxidation of the reduced indigo dye and minimize consumption of hydrosulfite and soda. By replacing air with inert gas, the system eliminates unnecessary oxidation reactions that occur in traditional open-tank systems, thereby reducing chemical consumption and associated pollution while maintaining effective dyeing conditions throughout the process cycle.
2Reliability
If traditional dyeing methods with multiple tanks and long oxidation passages are used, then dyeing can be performed, but the process is heavily dependent on external variables and operator skill
Solution Approach 1:
The patent merges multiple separate dyeing tanks and oxidation passages into a single integrated dyeing compartment where both impregnation and oxidation occur in sequence under controlled inert atmosphere. This consolidation reduces the number of separate tanks and process steps while maintaining reliable, consistent dyeing results by eliminating variability from external environmental factors that affect traditional multi-tank systems.
Solution Approach 2:
The system incorporates monitoring and control mechanisms that track dyeing parameters and adjust process conditions in real-time, reducing dependence on operator skill and external variables. The controlled inert atmosphere environment provides consistent baseline conditions that enhance reliability and reproducibility of dyeing results across different operations and operators.
3Loss of substance
If yarn is exposed to air for oxidation between dyeing tanks, then the dye can be fixed, but oxidation occurs during transport leading to increased chemical consumption
Solution Approach 1:
The patent maintains inert atmosphere throughout the entire dyeing compartment including during yarn transport and oxidation phases. This prevents premature oxidation of reduced indigo during yarn movement between treatment zones, eliminating the need for excessive hydrosulfite to compensate for oxidation losses. The inert environment ensures that oxidation occurs only when and where intended, minimizing chemical consumption while maintaining effective dye fixation.
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 device significantly reduces hydrosulfite and soda consumption, enhances dye absorption and fixation, and achieves consistent, high-quality color results with reduced waste and pollution, independent of external variables.
Implementation Method 1
The inert environment allows a reduction in the consumption of hydrosulfite and soda used in the dye bath with indigo
Implementation Method 2
The direct heating of the yarn 3, in an inert environment, increases the diffusion and fixing of the dye in the fibre
Implementation Method 3
the consequent dehydration by evaporation of the water contained allows a greater absorption of the dye
Implementation Method 4
The inert environment allows... the heating and dehydration of the yarn without oxidation of the dye contained therein
Data Source
AI summary
Device (100) and dyeing process in continuous with indigo for warp yarn chains (3) and/or fabrics, equipped with a first hermetically sealed dyeing compartment (1), suitable for containing the dye bath, and a hermetically sealed fixing/dehydration compartment (2) of the yarn (3). The two dyeing (1) and fixing/dehydration (2) compartments comprise an inert environment and are functionally and hermetically connected with each other and there are means (4) for introducing nitrogen and/or deoxygenated air inside the same compartments; inside the compartment (2) there is at least one means (5) for directly heating and/or dehydrating the yarn (3).