Bypass Flow Path for Ink Jet Bubble Removal
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Solution Overview
Problem
Bubbles formed in phase-change inks during freeze-melt cycles obstruct ink jet pathways, leading to temporary jet failures and acoustic disturbances, and existing purge methods are inefficient in removing bubbles from critical components.
Innovation Solution
The implementation of a branching channel network with variable fluidic resistance and temperature-dependent viscosity, using heaters and thermal gradients to guide bubbles through a bypass flow path to a vent, ensuring efficient bubble removal before they reach critical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bubbles are removed from ink flows, then ink jet reliability is improved, but device complexity increases due to additional bypass channels and heating elements
Solution Approach 1:
The ink flow path is segmented into a primary flow path for ink delivery and a bypass flow path for bubble removal. This segmentation allows bubbles to be diverted from the critical ink jet components through the bypass channel, improving reliability without requiring complete system redesign.
Solution Approach 2:
A heater element is introduced as an intermediary component in the bypass flow path. The heater creates a temperature gradient that generates natural convection currents, which actively transport bubbles away from the ink jet components without requiring mechanical pumps or complex control systems.
2Productivity
If heater is used to create temperature gradient, then bubble removal efficiency is improved, but energy consumption increases
Solution Approach 1:
The system utilizes changes in temperature as a key parameter to drive bubble removal. By locally heating the bypass channel, the ink viscosity changes and natural convection is generated, creating effective bubble transport without requiring high energy input across the entire system.
Solution Approach 2:
The patent replaces mechanical bubble removal systems (such as pumps or mechanical agitation) with a thermal field-based approach. The heater creates buoyancy-driven natural convection that automatically transports bubbles, eliminating the need for complex mechanical components and reducing overall energy consumption.
3Reliability
If bypass flow path is created, then bubble diversion is improved, but manufacturing complexity increases due to additional channels and stacked layers
Solution Approach 1:
The bypass flow path is implemented by utilizing the vertical dimension through stacked layers. The heater is positioned in a lower layer while the bypass channel is formed in an upper layer, allowing three-dimensional heat transfer and bubble diversion without requiring complex lateral routing or additional assembly steps.
Solution Approach 2:
The manufacturing process is segmented into layer fabrication and assembly steps. Each layer can be manufactured independently with standard techniques, and the bypass channel geometry is designed to be formed through simple cutting or molding operations on the stacked layers, reducing overall manufacturing 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
This solution effectively removes bubbles from ink flows, preventing obstructions and ensuring reliable ink jet performance by utilizing the natural tendency of bubbles to follow higher flow velocities, thereby maintaining system integrity and reducing the need for excessive ink volume during purging.
Implementation Method 1
a first temperature reduces a viscosity of ink flowing in the first path such that the first flow velocity of the bypass flow path is higher than the second flow velocity of the primary flow path
Implementation Method 2
The first flow velocity induces bubbles to travel via the bypass flow path instead of the primary flow path
Data Source
AI summary
An apparatus includes a bypass flow path between an ink supply port and a vent port and a primary flow path between the ink supply port and an ink delivery port. A first flow velocity of the bypass flow path is higher than a second flow velocity of the primary flow path. The first flow velocity induces bubbles to travel via the bypass flow path instead of the primary flow path.