Aqueous Developer Filtration for Flexographic Plate Liquid Reuse
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Solution Overview
Problem
Existing methods for recovering development liquid components from aqueous waste development liquid face challenges in achieving high recovery rates due to the simultaneous removal of impurities, leading to attenuation of development liquid concentration.
Innovation Solution
A treatment method involving low-temperature filtration of waste aqueous development liquid using a microfiltration membrane, followed by a reuse step, to enhance recovery rates of development liquid components such as surfactants, additives, and pH adjusters, while managing temperature and preventing membrane clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If waste aqueous development liquid is filtered through a microfiltration membrane to remove development residues, then development liquid components are removed simultaneously, but this causes attenuation of development liquid concentration and reduces recovery rates
Solution Approach 1:
The patent applies parameter changes by controlling the temperature of the waste aqueous development liquid to be 5°C or more and 48°C or less during filtration. This temperature control modifies the physical state and filtration characteristics of the liquid, enabling the microfiltration membrane to retain development liquid components while allowing development residues to pass through, thus resolving the contradiction between removing residues and preventing component loss
2Productivity
If filtration is performed at higher temperatures to improve flow rate, then filtration speed increases, but development liquid components are more readily removed with the permeate, reducing recovery efficiency
Solution Approach 1:
The patent optimizes the temperature parameter within the range of 5°C to 48°C to balance filtration speed and component retention. This controlled temperature range maintains adequate flow rate while preventing excessive removal of development liquid components, resolving the contradiction between productivity and substance loss
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 achieves enhanced recovery rates of development liquid components, reducing the amount of waste liquid discarded and lowering environmental impact by minimizing the use of fresh development liquid, thus being economically and environmentally beneficial.
Implementation Method 1
filtering the waste aqueous development liquid at 5° C. or more and 48° C. or less through a microfiltration membrane
Implementation Method 2
temperature control step of controlling the waste aqueous development liquid to have a temperature of 5° C. or more and 43° C. or less before the first filtration step
Data Source
AI summary
A treatment method for a waste aqueous development liquid generated through development of a flexographic printing original plate by using an aqueous development liquid, the method including: a first filtration step of filtering the waste aqueous development liquid at 5° C. or more and 48° C. or less through a microfiltration membrane to give a recovered liquid and a concentrated waste liquid; and a reuse step of reusing the recovered liquid for development of a flexographic printing original plate.