Immiscible Fluid Printhead Nozzle Capping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Inkjet printing devices face issues with 'long term decap' and 'short term decap' leading to fluid evaporation, pigment-ink-vehicle separation, and increased waste and wear due to current methods of cap application and maintenance.
Innovation Solution
Applying an immiscible fluid, such as isoparaffin, to selectively cap the nozzles of a printhead using an immiscible fluid applicator, which prevents evaporation and maintains nozzle functionality during printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical caps are used to cover nozzles during storage, then evaporation is prevented, but the printing process is interrupted by cap removal and reapplication
Solution Approach 1:
An immiscible fluid (such as oil) is introduced as an intermediary substance that forms a cap over the nozzle opening. This fluid cap prevents evaporation and contamination of the jettable fluid without requiring mechanical intervention, allowing continuous printing operations while maintaining nozzle integrity.
2Reliability
If mechanical caps are removed and reapplied frequently, then nozzle functionality is maintained, but wear and waste increase
Solution Approach 1:
The immiscible fluid automatically forms and maintains a cap over the nozzle through its own surface tension and immiscibility properties with the jettable fluid. This self-forming mechanism eliminates the need for external mechanical cap application and removal, reducing wear on mechanical components and minimizing waste ink generation during servicing routines.
3Ease of operation
If nozzles are left uncapped during storage, then printing is immediately available, but fluid evaporation and pigment separation occur
Solution Approach 1:
The immiscible fluid acts as a protective intermediary layer that seals the nozzle opening during storage periods. This allows the printhead to be stored without mechanical caps while preventing evaporation and pigment-ink-vehicle separation, maintaining fluid composition stability without interrupting printing readiness.
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
Reduces waste ink generation, minimizes nozzle clogging, and extends printer usage by maintaining fluid integrity and preventing pigment separation, while allowing continuous printing without mechanical cap removal and reapplication.
Implementation Method 1
prevents evaporation and maintains nozzle functionality
Implementation Method 2
selectively applying an immiscible fluid to a surface of a printhead
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A method of applying a cap to a printhead may comprise selectively applying an immiscible fluid to a surface of a printhead in which the immiscible fluid caps a number of nozzles on a number of nozzles defined within the printhead. A printhead may comprise a layer of immiscible fluid in which the immiscible fluid is selectively applied to the surface of the printhead and in which the immiscible fluid caps a number of nozzles defined within the printhead. A printer may comprise a printhead comprising a number of nozzles, an immiscible fluid applicator, and a processor to instruction the immiscible fluid applicator to apply a layer of immiscible fluid to the surface of the printhead.