Bidirectional Printing Fluid Circulation for Air Removal
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Solution Overview
Problem
Air trapped in the fluid circuit of printheads in printing systems can lead to frequent filter replacements and false sensor measurements, affecting the reliability of pressure sensors and flowmeters.
Innovation Solution
Implementing a bi-directional recirculation of printing fluid through the printhead, where the fluid is circulated in two directions between the reservoirs and the printhead ports, allowing trapped air to be removed from the system by switching between modes of operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If unidirectional fluid circulation is used, then the circuit is simple to operate, but air becomes trapped in the printhead filters causing frequent replacements and false sensor readings
Solution Approach 1:
The fluid circulation system dynamically switches between forward and reverse flow modes through controllable valves. The system transitions from a static unidirectional circulation to a dynamic bidirectional circulation that can adapt its flow direction to eliminate trapped air bubbles, thereby improving sensor measurement accuracy without permanently complicating the device structure
Solution Approach 2:
The system employs periodic switching between forward and reverse circulation modes. By alternating the flow direction in cycles, the system periodically eliminates trapped air from the printhead filters, preventing false sensor readings and extending filter life while maintaining relatively simple operational control
2Object-affected harmful factors
If filters are used to trap air, then air removal is effective, but filter replacement frequency increases
Solution Approach 1:
The system performs preliminary air removal by circulating fluid in reverse direction before the air bubbles can accumulate and clog the filters. By proactively eliminating air trapped in the printhead during circulation, the system prevents filter contamination before it occurs, reducing or eliminating the need for frequent filter replacements
Solution Approach 2:
The system converts the harmful effect of trapped air into a beneficial circulation pattern. By using reverse flow circulation, the system creates a beneficial effect where air bubbles are actively moved through the printhead and expelled from the system, transforming the air removal problem into an effective air elimination solution that protects the filters
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 approach reduces the instances of air being trapped in filters and improves sensor accuracy by effectively removing air from the system, extending filter life and enhancing the reliability of printing system components.
Implementation Method 1
a printing fluid circulation circuit to supply the printing fluid from the reservoir to a printhead
Data Source
AI summary
An example printing fluid circulation system includes a first circuit to circulate a printing fluid through a printhead in a first direction and a second circuit to circulate the printing fluid through the printhead in a second direction opposite to the first direction. The first circuit is activated during a first mode to circulate the printing fluid from a first reservoir to a second reservoir. The second circuit is activated during a second mode different from the first mode to circulate the printing fluid from the first reservoir to the second reservoir.