Dye fixing section for an indigo dyeing machine
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Solution Overview
Problem
Existing methods for dyeing textile substrates with indigo dye result in uniform dye distribution, making it difficult to achieve a fashionable worn-off appearance with white or undyed areas without compromising the fabric's integrity.
Innovation Solution
Applying leuco state indigo dye in a foam form to a traveling textile substrate in an inert atmosphere, allowing partial penetration, and then quickly fixing the dye with commercially pure oxygen to create a dyed outer ring and an undyed core, which can be further treated to expose the core.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If indigo dye is allowed to fully penetrate the substrate in an inert atmosphere, then uniform dye distribution is achieved, but it becomes difficult to create worn-off appearance with undyed areas
Solution Approach 1:
The patent applies preliminary action by quickly fixing the indigo dye at the surface level before complete penetration occurs. The oxygen exposure is timed to fix the dye precisely at the penetration depth achieved during the brief inert atmosphere dwell time, creating a controlled gradient with dyed outer ring and undyed core. This preliminary fixation enables subsequent creation of worn-off appearances without compromising fabric integrity.
2Adaptability or versatility
If fabric is completely dyed throughout and then subjected to wearing down to create worn-off appearance, then the fashionable look is achieved, but the fabric is often worn through leaving open areas
Solution Approach 1:
The patent applies local quality by creating a specific dye concentration gradient within the fabric structure - a dyed outer ring with an undyed core. This internal structure allows the surface to display the desired worn-off appearance while the undyed core maintains fabric strength and prevents wear-through. The quality is distributed locally rather than uniformly throughout the fabric.
3Productivity
If commercially pure oxygen is used to quickly fix the dye before complete penetration, then rapid fixation with dyed outer ring and undyed core is achieved, but oxygen consumption must be optimized
Solution Approach 1:
The patent applies partial action by using commercially pure oxygen in a controlled, limited manner - just enough to fix the dye at the desired penetration depth without over-fixing. The oxygen exposure is brief and targeted, occurring only after the substrate leaves the dwell chamber and the dye has penetrated to the desired extent. This partial application of oxidation achieves the required fixation speed while minimizing oxygen consumption.
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 allows for a rapid and controlled fixation of indigo dye, enabling the creation of a fashionable, worn-off appearance without significantly damaging the fabric, while minimizing the use of expensive oxygen.
Implementation Method 1
allow the dye to begin penetrating into the substrate
Implementation Method 2
the oxygen in the ambient atmosphere (approximately 20%) reacts with the dye to oxidize and thereby fix the dye in the substrate
Data Source
AI summary
A dye fixing section in a foam indigo dyeing machine for dyeing traveling sheets of textile yarn. The dye fixing section receives traveling sheets of yarn to which indigo dye in leuco form has been applied and penetrated partially through the yarn. Oxygen is applied to the substrate to set the dye at the level of penetration achieved as it enters the dye fixing section, to produce yarns in the sheet with outer dyed rings and undyed cores.