Heated Shield Condensation Control for Inkjet Printheads
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Solution Overview
Problem
Inkjet printing systems face issues with condensation of vaporized carrier fluids, leading to electrical shorts, corrosion, and image artifacts due to the formation of condensates on printheads and other printer components, especially in high-speed commercial printing where rapid evaporation creates localized vapor concentrations.
Innovation Solution
The implementation of a condensation control system with thermally insulating shields and energy sources to actively heat the shields above the condensation temperature of the vaporized carrier fluids, preventing condensation on printheads and maintaining optimal operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed printing is implemented, then productivity is improved, but condensation of vaporized carrier fluids occurs leading to reliability deterioration
Solution Approach 1:
A shield is introduced as an intermediary component between the printhead and the target area. The shield is heated to a temperature above the dew point of the vaporized carrier fluid, creating a thermal barrier that prevents condensation on the printhead while allowing ink droplets to pass through to the target area.
Solution Approach 2:
The temperature parameter of the shield is changed and maintained above the dew point of the vaporized carrier fluid. This parameter change transforms the shield from a passive component to an active condensation prevention device, resolving the reliability issue caused by high-speed printing.
2Reliability
If shields are heated to prevent condensation, then reliability is improved, but energy consumption increases
Solution Approach 1:
Heating is applied locally only to the shield component that directly interfaces with the vaporized carrier fluid, rather than heating the entire printhead assembly. This localized approach minimizes energy consumption while effectively preventing condensation where it would cause harm.
3Manufacturing precision
If shields are positioned close to printheads, then condensation control precision is improved, but manufacturing complexity increases
Solution Approach 1:
The shield serves multiple functions: it acts as a thermal barrier to prevent condensation, a physical barrier to protect the printhead, and a structural component that can be integrated into existing printhead assemblies. This multi-functionality reduces the need for additional components, simplifying the overall device 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 reduces the risk of condensation-related issues, ensuring reliable inkjet printing by maintaining the shields above the condensation temperature, thus preventing damage and image degradation, while allowing for individualized adjustment and protection of multiple printheads.
Implementation Method 1
an energy source operable to provide energy that can be applied to cause the shields to be heated
Implementation Method 2
condensation of vaporized carrier fluids... preventing condensation on printheads
Implementation Method 3
each cap has a thermally insulating separator that positions a shield between the face of one of the printheads and the target area
Data Source
AI summary
Inkjet printing systems are provided. In one aspect an inkjet printing system has a plurality of inkjet printheads, a plurality of caps are provided with each cap has a thermally insulating separator that positions a shield between the face of one of the printheads and the target area for the printhead and creating a printing region between the shield and the target area and a shielded region between the face and the shield. The shield has at least one opening through the shield through which the nozzles of the printhead can jet the ink droplets to the target area. An energy source provides energy that can be applied to cause the shields to be heated.