Self-Sealing Filter Module for Continuous Inkjet Printers
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Solution Overview
Problem
Filter modules in continuous inkjet printers often contain significant amounts of ink during replacement, leading to HAZMAT disposal concerns and messy, time-consuming removal processes, which disrupt production and require special handling.
Innovation Solution
A self-sealing filter module with valve assemblies that minimize ink leakage by automatically sealing when disconnected from the ink flow path, allowing for efficient emptying and reducing the ink volume to non-hazardous levels, thereby eliminating the need for special disposal precautions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter module is replaced at timed service intervals, then filtration effectiveness is maintained, but the replacement process is time-consuming and requires the printer to be non-operational
Solution Approach 1:
The filter module is designed as a self-contained, replaceable unit that can be quickly swapped without affecting the rest of the printing system. This modular segmentation allows for rapid replacement while maintaining continuous operation of the printer.
Solution Approach 2:
A quick-release mechanism is pre-configured in the filter module that automatically seals ink pathways when the module is removed. This preliminary sealing action prevents ink leakage during replacement, eliminating the need for time-consuming manual sealing procedures and allowing immediate replacement without printer shutdown.
2Reliability
If a filter module contains significant amounts of ink during replacement, then the filter can be effectively used, but special HAZMAT disposal precautions are required
Solution Approach 1:
A drain valve is integrated into the filter module that allows the ink to be extracted and drained into the printer's ink supply system. This extraction of the harmful substance (ink) from the filter module before disposal eliminates HAZMAT classification, as the remaining ink volume falls below hazardous thresholds.
Solution Approach 2:
Instead of discarding the ink contained in the filter module as waste, the system recovers it by draining it back into the main ink supply. This recovery process converts potential HAZMAT waste into reusable ink, eliminating disposal restrictions and environmental concerns.
3Productivity
If a filter module is designed for easy removal, then replacement speed is improved, but ink leakage during removal increases
Solution Approach 1:
The quick-release mechanism is pre-configured with automatic sealing features that activate immediately upon removal of the filter module. This preliminary sealing action prevents ink leakage during the rapid replacement process, allowing both fast replacement and clean operation.
Solution Approach 2:
Seal elements are pre-positioned in the ink pathways of the filter module housing. When the module is quickly removed, these seals immediately engage to cushion and contain any pressure differential, preventing ink from leaking out during the rapid replacement operation.
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
The self-sealing filter module effectively reduces ink leakage during removal, allowing for safe disposal in regular waste streams and minimizing downtime in production environments by simplifying the filter replacement process.
Implementation Method 1
a seal element in the form of an elastomeric O-ring resiliently biased against the ink flow path
Data Source
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AI summary
A filter module (38) for a continuous inkjet printer (10) comprising a filter housing (40) and a filter medium (42) fixed within the housing (40). The filter housing (40) further includes an inlet portal (44) through which ink flows into the housing under pressure and a first self-sealing valve assembly (54) disposed within the inlet portal. In addition, housing includes an outlet portal (46) through which ink flows out of the housing (40) under pressure and a second self-sealing valve assembly (56) disposed within the outlet portal (46). The first and second valve assemblies (54, 56) open when mechanically connected to an ink flow path (34) from an ink tank (18) to a print head (14), and the first and second valve assemblies (54, 56) seal closed when mechanically disconnected from the ink flow path (34).