Ink-jet Recording Head Silver Particle Discharge Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Ink-jet recording methods using ink containing silver particles face significant discharge deviation due to the high thermal conductivity of silver particles, leading to excessive bubbling and adherence to the discharge port, which results in inconsistent ink deposition and image quality issues.
Innovation Solution
Applying a single pulse waveform voltage to the heat generation unit instead of a preheat and main heat pulse combination, minimizing heat transfer and bubbling, and adjusting pulse width and voltage to maintain consistent ink discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a preheat pulse and main heat pulse combination is applied to the heat generation unit, then ink discharge is promoted, but discharge deviation increases due to excessive bubbling and adherence to the discharge port
Solution Approach 1:
The patent divides the ink discharge process into two separate voltage application steps: a preheat voltage applied before discharge to warm the ink, and a main discharge voltage applied to eject the ink. This segmentation allows optimized control of each phase, preventing excessive bubbling during preheating while ensuring adequate discharge force, thereby resolving the contradiction between discharge efficiency and precision
Solution Approach 2:
The patent optimizes specific parameters including the preheat voltage magnitude (0.5-2.0 V), preheat duration (1-10 ms before discharge), and main discharge voltage characteristics. By precisely controlling these parameters, the system achieves sufficient ink warming without excessive thermal expansion and bubbling, thus maintaining both discharge efficiency and positioning accuracy
2Reliability
If thermal energy is applied to discharge silver particle ink, then metallic image recording is achieved, but discharge deviation occurs due to high thermal conductivity of silver particles
Solution Approach 1:
The patent introduces a preheat voltage as an intermediary step that gently warms the ink containing silver particles before the main discharge. This intermediate heating phase prevents sudden thermal shock to the silver particles, reducing excessive bubbling and adherence to the discharge port, thereby maintaining both metallic image quality and discharge precision
Solution Approach 2:
The patent applies a preliminary preheat voltage to the ink before main discharge to gradually increase ink temperature and reduce viscosity. This preliminary action prepares the silver particle ink for smooth ejection without causing excessive thermal expansion or particle adherence, thus resolving the contradiction between reliable metallic image formation and precise discharge positioning
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 suppresses discharge deviation and maintains consistent ink deposition, improving image quality and reducing density variations, while ensuring efficient inkjet recording with silver particle inks.
Implementation Method 1
a heat generation unit which generates thermal energy for discharging aqueous ink by discharging the aqueous ink from the recording head based on image data by action of the thermal energy
Data Source
AI summary
A method for ink-jet recording comprising recording an image on a recording medium using an ink-jet recording apparatus including a recording head equipped with a heat generation unit which generates thermal energy for discharging aqueous ink by discharging the aqueous ink from the recording head based on image data by action of the thermal energy, wherein the aqueous ink is discharged once by applying a single pulse waveform voltage to the heat generation unit in the recording, and wherein the aqueous ink includes silver particles.