Discharge printing device and discharge printing method
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Solution Overview
Problem
Current discharge printing methods for fabric face challenges in achieving optimal temperature and time conditions for reduction and oxidation reactions, leading to inefficiencies in dye application and potential fabric discoloration.
Innovation Solution
A discharge printing device and method that apply a reducing agent to fabric, followed by contact or non-contact heating under specific temperature and time conditions to accelerate reduction and oxidation reactions, using a contact heating unit with a heat press plate and optionally a non-contact heating unit, to control the chroma and prevent fabric discoloration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a reducing agent is applied to fabric and heat treatment is performed, then discharge printing is achieved, but optimal temperature and time conditions are difficult to achieve leading to inefficiencies in dye application
Solution Approach 1:
The heat treatment process is segmented into distinct phases: a first heat treatment phase for accelerating the reduction reaction, and a second heat treatment phase for accelerating the oxidation reaction. This segmentation allows each phase to be optimized independently for its specific chemical reaction, improving overall dye application efficiency while maintaining precise temperature and time control for each stage.
2Manufacturing precision
If heat treatment is applied to accelerate reduction and oxidation reactions, then discharge printing quality improves, but fabric discoloration may occur
Solution Approach 1:
The method applies preliminary anti-action by carefully controlling the heat treatment parameters to prevent fabric discoloration before it can occur. The first heat treatment phase is optimized to accelerate reduction reaction while the second phase accelerates oxidation reaction, with both phases using controlled temperature and time ranges that achieve high discharge printing quality without causing harmful discoloration effects on the fabric.
3Speed
If contact heating is used to accelerate reduction reaction, then reaction speed increases, but additional heating may be needed for oxidation reaction
Solution Approach 1:
The contact heating unit performs continuous useful action by executing two sequential heat treatment phases without interruption. The first phase accelerates the reduction reaction and the second phase accelerates the oxidation reaction, both using the same contact heating unit. This continuous operation eliminates the need for additional heating equipment while maintaining high reaction speeds for both chemical processes.
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 method ensures effective discharge printing with improved dye application efficiency and prevents fabric discoloration by controlling the reduction and oxidation reactions, achieving high L* values and low color differences, thus maintaining the fabric's appearance.
Implementation Method 1
a contact heating unit configured to subject a reducing agent-applied area to contact heating
Implementation Method 2
subjects the reducing agent-applied area to contact heating to accelerate a reduction reaction
Implementation Method 3
subjects the reducing agent-applied area to contact heating to accelerate an oxidation reaction
Data Source
AI summary
A discharge printing device includes an application unit configured to apply a reducing agent to fabric and a contact heating unit configured to subject a reducing agent-applied area to contact heating and satisfies any of the conditions (a1)-(c1) and (d1)-(e1): the conditions (a1)-(c1): in the contact heating, a heating temperature is 100° C. or more, and a heating time is 60 seconds or more; the conditions (d1)-(e1): the contact heating unit subjects the reducing agent-applied area to contact heating to accelerate a reduction reaction and subjects, after the acceleration of the reduction reaction, the reducing agent-applied area to contact heating to accelerate an oxidation reaction, or the discharge printing device further comprises a non-contact heating unit, and the non-contact heating unit subjects, after the acceleration of the reduction reaction, the reducing agent-applied area to non-contact heating to accelerate an oxidation reaction.