Capillary Channels for Bubble Removal in Horizontal Ink Conduits
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Solution Overview
Problem
Inkjet printers face challenges in removing air bubbles from horizontal ink flow conduits due to geometric constraints and design criteria, which impede ink flow.
Innovation Solution
A new fluid flow structure utilizing capillary channels within conduits to encourage gas bubbles to move out of the conduits without obstructing ink flow, featuring expanding conduits and capillary channels that extend from the ink reservoir to the printhead, aiding in the removal of gas bubbles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If horizontal sections are included in the ink flow conduits due to geometric constraints, then the conduit design meets spatial requirements, but air bubbles accumulate and impede ink flow
Solution Approach 1:
The conduit is segmented into a main ink flow channel and separate capillary channels. The capillary channels are positioned at the top of the horizontal section to specifically target air bubble accumulation, while the main channel maintains uninterrupted ink flow. This segmentation allows the system to maintain horizontal geometry for space efficiency while providing a dedicated path for bubble removal.
Solution Approach 2:
Capillary channels act as intermediary structures that mediate between the horizontal conduit geometry and air bubble removal requirements. These channels provide an alternative pathway that facilitates bubble escape without disrupting the primary ink flow through the main conduit, resolving the conflict between maintaining horizontal sections and ensuring reliable ink delivery.
2Adaptability or versatility
If complex pathways are used to route ink from supplies to printheads, then spatial constraints are satisfied, but air bubble removal becomes more difficult
Solution Approach 1:
The complex pathway is segmented into functional zones: main ink transport channels and integrated capillary bubble removal channels. The capillary channels are strategically placed at critical horizontal sections throughout the complex routing path, breaking down the bubble removal problem into manageable local solutions rather than requiring complex global purging mechanisms.
Solution Approach 2:
The capillary channels are nested within or alongside the main conduit structure. This nested arrangement allows the bubble removal functionality to be integrated into the existing complex pathway without adding external complexity, maintaining routing flexibility while simplifying the bubble purging mechanism through elegant integration.
3Device complexity
If conventional conduits are used without capillary channels, then the structure is simple, but gas bubbles cannot be effectively removed from horizontal sections
Solution Approach 1:
The conduit incorporates capillary channels that utilize capillary action through their porous-like structure. These channels have specific dimensional characteristics that enable selective fluid transport based on surface tension effects, allowing gas bubbles to be drawn out while maintaining ink flow in the main channel. This approach adds minimal structural complexity while dramatically improving bubble removal reliability.
Solution Approach 2:
The system changes the physical parameters of the conduit by introducing capillary channels with specific diameter and surface properties. This parameter change enables capillary action to occur, fundamentally altering the fluid dynamics in horizontal sections to favor bubble removal. The structural modification is minimal but the functional impact is significant, improving reliability without substantially increasing complexity.
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
Effectively removes gas bubbles from horizontal conduits, ensuring continuous ink flow and reducing the risk of air bubble entrapment, applicable to various liquid handling devices beyond inkjet printers.
Implementation Method 1
The new structure utilizes capillary channels within a conduit to encourage gas bubbles to move out of the conduit without obstructing the flow of ink through the conduit
Implementation Method 2
capillary channels within a conduit to encourage gas bubbles to move out of the conduit without obstructing the flow of ink
Data Source
AI summary
In one example, a fluid flow structure includes a flow path configured to simultaneously move a liquid up a slope and move a bubble down the slope. In one example, a fluid flow structure includes a horizontal conduit, a reservoir to hold a liquid above the conduit, an inlet into which liquid from the reservoir may enter the conduit, an outlet through which liquid may leave the conduit, and multiple capillary channels in the conduit extending continuously from the inlet to the outlet.