Printing Fluid Circulation System Prevents Pigment Settling
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Solution Overview
Problem
Ink and other printing fluids can settle and agglomerate in the flow path or devices of printing systems, leading to partial or full blocking of the flow path, which hinders or prevents the flow of printing fluid during subsequent print jobs.
Innovation Solution
A printing fluid circulation system that moves printing fluid between two reservoirs without completing a circuit, using a supply system with pumps, valves, and a controller to maintain pigment particles in suspension, thereby reducing the risk of settling and agglomeration, and avoiding the need for mechanical vibration, purging, or using cleaning agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If printing fluid is stored in a reservoir and supplied to printhead during print jobs, then the printing system can perform printing operations, but pigment particles settle and agglomerate in the flow path when fluid is at rest
Solution Approach 1:
The system performs preliminary circulation action during idle time between print jobs to prevent pigment settling before it becomes a problem. The circulation pump operates during these intervals to keep particles suspended, proactively maintaining flow path clearance without waiting for blocking to occur.
Solution Approach 2:
The circulation system maintains continuous particle suspension by operating the circulation pump continuously or periodically, ensuring that the beneficial effect of particle mixing is uninterrupted. This continuous action prevents settling during idle periods while maintaining readiness for print operations.
2Stability of the object's composition
If printing fluid circulates continuously through a complete circuit, then pigment particles remain suspended, but the system complexity increases with additional pumps and valves
Solution Approach 1:
The circulation system is segmented into two separate reservoirs with selective fluid transfer between them, rather than a single complex continuous circuit. This segmentation simplifies the overall system architecture while achieving the same particle suspension goal through alternating circulation patterns.
Solution Approach 2:
Instead of continuous circulation through a single path, the system uses periodic action by alternating between two reservoirs. The circulation pump operates in cycles, transferring fluid from one reservoir to another, which maintains particle suspension with simpler hardware compared to a continuous multi-loop system.
3Stability of the object's composition
If mechanical vibration is used to prevent particle settling, then pigment remains suspended, but the system becomes noisy and complex to implement
Solution Approach 1:
The system replaces mechanical vibration mechanisms with a fluid circulation approach. Instead of using vibrators or agitators that physically shake the fluid, the system uses a pump to circulate the fluid through the flow path, achieving particle suspension through fluid motion rather than mechanical vibration.
Solution Approach 2:
The system uses hydraulic principles by employing a circulation pump to move printing fluid through the flow path and reservoirs. This hydraulic approach to particle suspension avoids the need for mechanical vibration devices, reducing noise and complexity while effectively keeping pigment particles in suspension.
4Reliability
If purging or cleaning agents are used to clear settled pigment, then flow path blocking is removed, but printing fluid becomes contaminated and print jobs are delayed
Solution Approach 1:
The system converts the idle time between print jobs, which would normally be wasted, into a beneficial circulation period. During these intervals, the circulation pump actively prevents pigment settling, turning non-productive time into a maintenance period that prevents future blocking without requiring purging operations.
Solution Approach 2:
The circulation system performs preliminary prevention action during idle time, stopping pigment settling before it causes blocking that would require purging. This proactive approach eliminates the need for reactive cleaning operations that would delay subsequent print jobs.
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 effectively prevents the settling and agglomeration of pigment particles, ensuring uninterrupted print fluid flow and reducing waste by maintaining the fluid in motion between print jobs, thus enhancing the reliability and efficiency of the printing system.
Implementation Method 1
maintain pigment particles in suspension
Implementation Method 2
printing fluid circulation system that moves printing fluid between two reservoirs
Data Source
AI summary
A printing fluid circulation system is described. The system comprises first and second reservoirs, an outlet to supply printing fluid to a fluid inlet of a printhead, an inlet to receive printing fluid from a fluid outlet of the printhead, and a supply system. The supply system is to operate in a first mode to concurrently supply printing fluid from the first reservoir to the outlet and from the inlet to the second reservoir, and in a second mode to concurrently supply printing fluid from the second reservoir to the outlet and from the inlet to the first reservoir.