Yarn Dye Range Process to Retain White Core and Reduce Chemical Use
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Solution Overview
Problem
Traditional denim dyeing processes consume excessive chemicals and heat, leading to environmental issues and high costs, while failing to effectively retain a white core in yarns, resulting in excessive dye penetration into the yarn's core area.
Innovation Solution
The CleanKore technology modifies the scouring, scour rinsing, dyeing, and dye rinsing stages of existing dye ranges by adjusting immersion times, temperatures, caustic soda concentrations, pH levels, and wetting agent usage to minimize dye penetration into the yarn's core, allowing only the outer perimeter to be dyed, thereby retaining a white core.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional scouring techniques are used to clean yarns, then the yarns are excessively cleaned and oils and waxes are removed from the core area, but this causes dye penetration and fixing within the core area of the yarns
Solution Approach 1:
The scouring process is modified to create different cleaning conditions in different parts of the yarn. The core area retains oils and waxes while the outer surface is cleaned, achieving local differentiation of cleaning intensity. This is accomplished through controlled scouring parameters that prevent complete removal of natural substances from the yarn core.
Solution Approach 2:
The yarns undergo preliminary scouring with controlled duration and intensity before dyeing to prepare the surface for dye absorption while preserving the core. The scouring stage is optimized to clean only the outer layers, creating a gradient structure that facilitates subsequent selective dyeing of the periphery while protecting the core.
2Ease of manufacture
If conventional dye range operations are used, then the process is simple and established, but it consumes excess amounts of chemicals and heat and causes environmental issues
Solution Approach 1:
The dyeing process parameters are optimized to reduce chemical and energy consumption. Scouring time is reduced to 5-20 seconds, caustic concentration is controlled at 1-40 g/L, and wetting agent concentration is maintained at 1-4 g/L. The process operates at room temperature or slightly elevated temperatures, eliminating the need for excessive heat input while maintaining effective dye penetration.
Solution Approach 2:
The invention extracts and eliminates unnecessary process steps and excessive chemical treatments from the conventional dyeing sequence. By removing redundant scouring cycles and optimizing chemical concentrations, the process achieves effective dyeing with minimal chemical input, reducing environmental impact while maintaining manufacturing simplicity.
3Reliability
If traditional scouring and dyeing processes are used, then the yarns are thoroughly processed, but the white core is not retained and dye penetration occurs in the center area
Solution Approach 1:
The process creates a gradient structure in the yarn where the outer periphery is scoured and dyed while the core retains its natural white color. This local differentiation is achieved through controlled scouring that removes substances only from the outer layers, and through dyeing conditions that facilitate penetration primarily to the periphery, ensuring both dye fastness on the surface and white core retention.
Solution Approach 2:
The scouring and dyeing actions are applied partially rather than excessively throughout the entire yarn cross-section. Scouring is limited to the outer layers with controlled time and chemical concentration, and dyeing is optimized to penetrate primarily the periphery. This partial action achieves the desired effect of dyed surface with white core without over-processing the entire yarn.
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 approach reduces chemical and energy consumption, achieves a larger, more distinct white core, and enhances dye fastness, resulting in cost savings and improved environmental sustainability while maintaining desired color shades.
Implementation Method 1
a scouring stage to clean the yarns
Implementation Method 2
a dyeing stage to dye the yarns
Implementation Method 3
an oxidation stage to oxidize the dye applied to the yarns
Data Source
AI summary
The present invention relates to yarn dyeing, such as denim dyeing. A process provides a dyed yarn having reduced dye penetration and a white core at lower cost. The improved process for yarn dyeing is referred to herein as the CleanKore technology. The CleanKore technology improves one or more steps in dye ranges to achieve dyeing of the yarn while retaining a white core at the center of the yarn. When viewing a cross-section of a yarn, the peripheral portion is dyed while the center remains white (not dyed). The CleanKore technology modifies the scouring stage (or phase), the scour rinsing stage, the dyeing stage, and/or the dye rinsing phase of existing dye ranges. The modifications may be applied individually or any combinations thereof to the existing dye range.