Ink Circulation System with Predictive Pressure Control
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Solution Overview
Problem
Inkjet printing systems face challenges in maintaining optimal ink circulation due to varying ink ejection amounts, leading to air intrusion, nozzle failures, and instability in the meniscus, as well as premature wear of circulation pumps.
Innovation Solution
An ink circulation system that includes a supply tank, return tank, connecting pipes, a head for ink ejection, a pressure-difference producer, and a predictor that adjusts the ink supply based on predicted ejection amounts from image data, using a pressure controller to manage pressure differences and control ink flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of ink to be circulated is increased to prevent air intrusion during high ejection conditions, then air intrusion is prevented, but ink degradation accelerates and circulation pump lifetime is shortened during low ejection conditions
Solution Approach 1:
The ink circulation system dynamically adjusts the circulation amount based on real-time ejection conditions. When ejection amount increases, the system increases circulation to prevent air intrusion; when ejection amount decreases, the system reduces circulation to prevent ink degradation and extend pump lifetime. This dynamic adaptation resolves the contradiction between maintaining reliability under varying conditions and preserving component longevity.
Solution Approach 2:
The system changes the circulation parameter (ink flow rate) according to the ejection conditions. By monitoring the ejection amount and adjusting the circulation amount accordingly, the system optimizes both air intrusion prevention and pump lifetime extension. The circulation amount is not fixed but varies as a parameter responsive to operational demands.
2Reliability
If the amount of ink to be circulated is set for high ejection conditions, then air intrusion is prevented, but meniscus stability deteriorates during low ejection conditions
Solution Approach 1:
The system dynamically adjusts circulation amount to match ejection demands. During low ejection conditions, reduced circulation maintains optimal meniscus stability; during high ejection conditions, increased circulation prevents air intrusion. This dynamic control ensures both meniscus stability and reliability are maintained across varying operational states.
Solution Approach 2:
The circulation parameter is adjusted based on ejection conditions to maintain meniscus stability. By changing the circulation amount in response to ejection variations, the system prevents both air intrusion and meniscus instability, optimizing the operational parameters for different printing states.
3Quantity of substance
If the amount of ink to be circulated is increased to match maximum ejection demand, then sufficient ink supply is ensured, but ink degradation accelerates during low demand periods
Solution Approach 1:
The system dynamically adjusts circulation amount based on real-time ejection demands. During high demand periods, increased circulation ensures sufficient ink supply; during low demand periods, reduced circulation minimizes ink degradation. This adaptive approach resolves the contradiction between ensuring adequate supply and preventing substance loss.
Solution Approach 2:
The circulation parameter is varied according to ejection conditions. The system monitors ink ejection amount and adjusts circulation accordingly, ensuring sufficient ink supply during high ejection while reducing circulation during low ejection to prevent degradation, thus optimizing both supply adequacy and substance preservation.
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 system ensures accurate prediction and control of ink ejection, preventing air intrusion, stabilizing the meniscus, and extending the lifespan of components by optimizing ink circulation according to the printing requirements.
Implementation Method 1
a pressure-difference producer that produces a pressure difference between the supply tank and the return tank to send ink from the supply tank to the return tank through the first connecting pipe
Data Source
AI summary
A technique for making the amount of ink to be calculated appropriate in accordance with the amount of ink to be ejected from heads is provided. An inkjet printing apparatus includes a supply tank, a return tank, a first connecting pipe, a second connecting pipe, a head, a pressure-difference producer, an ejection-amount predictor, and a pressure controller. The first connecting pipe transfers ink in the supply tank to the return tank. The second connecting pipe returns ink in the return tank to the supply tank. The head is interposed in the first connecting pipe. The pressure-difference producer sends ink from the supply tank to the return tank through the first connecting pipe. The ejection-amount predictor predicts the amount of ink to be ejected at a time to come after the present time from the head. The pressure controller controls the amount of ink to be supplied from the supply tank to the head, by controlling the pressure-difference producer in accordance with the predicted amount of ink to be ejected.