Continuous Warp Chain Dyeing Chamber for Air and Nitrogen Operation
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Solution Overview
Problem
The continuous dyeing of denim warp chains with indigo dye is complex due to factors like temperature, humidity, and chemical conditions, leading to inconsistent results, high economic costs, and environmental pollution, and traditional methods require multiple tanks and significant resources, making it difficult to manage and maintain optimal dyeing conditions.
Innovation Solution
A multifunctional continuous dyeing apparatus that can operate in both air and inert environments, reducing the number of tanks, minimizing sodium hydrosulphite and caustic soda consumption, and allowing for flexible operation with the option to use traditional or new dyeing technologies, incorporating a ring system to improve dye distribution and reduce yarn loss during batch changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional continuous dyeing method with multiple tanks is used, then dyeing capacity and color fastness are improved, but device complexity and resource consumption increase
Solution Approach 1:
The patent combines multiple dyeing tanks into a single integrated dyeing chamber where yarn passes through the dye bath multiple times in a continuous loop. This merging of functions reduces the number of separate tanks while maintaining the multi-impregnation process necessary for good color fastness.
Solution Approach 2:
The single dyeing chamber serves multiple functions: it acts as both the dye bath container and the oxidation chamber, and accommodates multiple passes of the yarn through the same space. This multi-functionality reduces overall device complexity while achieving the same dyeing results.
2Manufacturing precision
If multiple impregnations and oxidations are performed, then color intensity and corticality are improved, but consumption of sodium hydrosulphite and caustic soda increases
Solution Approach 1:
The patent implements a continuous dyeing process where yarn continuously circulates through the dye bath and oxidation zones without interruption. This continuity allows for better control of chemical consumption by maintaining steady-state conditions and avoiding the start-stop cycles that waste chemicals.
Solution Approach 2:
The patent optimizes parameters such as dye bath temperature, chemical concentration, and circulation speed to achieve the desired color intensity with minimal chemical consumption. By carefully controlling these parameters, the process reduces waste of sodium hydrosulphite and caustic soda while maintaining high color fastness.
3Reliability
If traditional dyeing process with long oxidation times is used, then complete dye fixation is achieved, but production time and productivity are reduced
Solution Approach 1:
The patent uses periodic circulation of yarn through the dye bath and oxidation zones, creating repeated cycles of impregnation and oxidation. This periodic action achieves complete dye fixation through multiple short exposure cycles rather than one long cycle, thereby reducing total production time.
Solution Approach 2:
The patent replaces traditional long-duration static oxidation with a dynamic system where yarn is continuously moved through oxidation zones. This mechanical substitution of continuous motion for static waiting time accelerates the oxidation process while ensuring complete dye fixation.
4Reliability
If indigo dye is applied to cotton yarn, then unique vintage appearance and color fastness are achieved, but affinity between dye and fiber is poor
Solution Approach 1:
The patent applies preliminary treatments to the cotton yarn before dyeing, such as mercerization or enzyme treatment, to enhance the fiber's affinity for indigo dye. This preliminary preparation allows better dye penetration and fixation while maintaining the characteristic vintage appearance of indigo-dyed denim.
Solution Approach 2:
The patent uses intermediary substances or modified dye bath compositions that facilitate the bonding between indigo dye and cotton fiber. These intermediaries improve the affinity between the hydrophobic indigo and cellulose fiber, enabling better color fastness despite the inherent poor affinity.
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 solution enhances dye fixation and diffusion, reduces waste and resource consumption, and allows for more flexible and efficient production, enabling consistent and reproducible dyeing results while minimizing environmental impact and operational costs.
Implementation Method 1
the indigo dye, due to the relatively small molecule and low affinity with cellulose fiber, in order to be applied must not only be reduced in alkaline solution (leuco)
Implementation Method 2
it also requires being subjected to a plurality of impregnations alternated with squeezing and subsequent air oxidation
Data Source
AI summary
A multifunctional continuous dyeing apparatus provided at a bottom with a main body within which are formed in a sequence, with reference to the feeding direction of the yarn, at least a first dyeing group for the yarn, provided with a respective first squeezing device of the yarn, an oxidation or diffusion/fixation group, placed downstream of the first dyeing group and arranged for the oxidation of the dyed yarn or for the diffusion/fixation of the dye in the fiber of the dyed yarn, and at least a second dyeing group of the yarn, arranged downstream of the oxidation or diffusion/fixation group and in turn provided with a respective second squeezing device of the yarn, where at least the first dyeing group, the first squeezing device, the oxidation or diffusion/fixation group and the second dyeing group are hermetically sealing enclosed by at least one covering case, integral at the top with the main body, and provided with a plurality of doors which are at least partially openable to perform the dyeing of the yarn in an environment exposed to air and which are reclosable to perform the dyeing of the yarn in an inert environment under nitrogen.