Silver Nanoparticle Inkjet Ink for Opaque Printing Without Nozzle Clogging
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Solution Overview
Problem
Thermal inkjet printing on dark colored substrates faces challenges with opaque pigmented inks that settle, leading to nozzle clogging and poor image quality due to premature drying, requiring mechanical mechanisms for pigment suspension and prone to unreliable jetting.
Innovation Solution
Inkjet inks formulated with terpene resin or terpene phenol resin, volatile organic solvents, and silver nanoparticles, which stabilize the nanoparticles and enable reliable jetting with extended decap times, forming opaque images on dark substrates without mechanical assistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If opaque pigmented inks are used to provide legible images on dark colored substrates, then image opacity is improved, but nozzle clogging occurs due to pigment settling
Solution Approach 1:
The patent changes the particle size parameter of the opacifying agent from conventional large particles (200 nm or larger) to ultrafine particles (less than 200 nm, preferably 10-150 nm). This parameter change enables the ink to maintain opacity while preventing pigment settling and nozzle clogging, as the ultrafine particles remain stably suspended without requiring mechanical agitation mechanisms.
Solution Approach 2:
The patent uses composite material formulation by combining ultrafine opacifying particles with specific binder resins and solvent systems. This composite approach creates a stable ink composition where the ultrafine particles are effectively dispersed and suspended, providing both opacity and jetting reliability without mechanical suspension mechanisms.
2Illumination intensity
If high density pigment application is used to achieve adequate opacity on dark substrates, then image legibility is improved, but shelf-life deteriorates due to settling
Solution Approach 1:
The patent changes the particle size parameter to ultrafine (less than 200 nm), which fundamentally alters the settling behavior. The ultrafine particles have significantly reduced gravitational settling tendency compared to conventional particles, allowing the ink to maintain adequate opacity through coarser screen meshes while extending shelf-life by preventing sedimentation.
Solution Approach 2:
The patent applies local quality by using ultrafine particles that can pass through coarser screen meshes (e.g., 100 mesh or lower) while still providing adequate opacity. This local adaptation of particle size enables the ink to function properly in standard printing equipment without requiring fine mesh screens, thereby extending shelf-life.
3Reliability
If mechanical suspension mechanisms are used to prevent pigment settling, then jetting reliability is improved, but device complexity increases
Solution Approach 1:
The patent changes the particle size parameter to ultrafine (less than 200 nm), which eliminates the need for mechanical suspension mechanisms. The ultrafine particles naturally remain stably suspended in the ink vehicle without requiring shaking or stirring mechanisms, thereby maintaining jetting reliability while dramatically simplifying the printing device.
Solution Approach 2:
The patent extracts and eliminates the mechanical suspension mechanism from the printing system by using ultrafine particles that self-suspend. This removes the complex mechanical components (shaking mechanisms, stirring devices) while maintaining the essential function of preventing pigment settling.
4Ease of manufacture
If open atmosphere printhead design is used for thermal inkjet printing, then manufacturing simplicity is improved, but nozzle clogging occurs due to solvent loss
Solution Approach 1:
The patent changes the particle size parameter to ultrafine (less than 200 nm), which fundamentally alters the ink's evaporation and drying characteristics. The ultrafine particles create a more stable ink composition that is less prone to premature drying and solvent loss, maintaining nozzle reliability in open atmosphere designs.
Solution Approach 2:
The patent uses composite material formulation with ultrafine particles, specific binders, and solvents to create an ink composition that is optimized for open atmosphere printhead designs. This composite formulation reduces solvent loss and prevents nozzle clogging while maintaining the manufacturing simplicity of uncapped printheads.
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 inkjet inks provide stable, opaque images on dark substrates with prolonged decap times, preventing nozzle clogging and ensuring reliable jetting and image quality, even under extended idle conditions.
Implementation Method 1
drying of the inkjet ink and coalescence of the silver nanoparticles provides opaque printed images
Implementation Method 2
drying of the inkjet ink and coalescence of the silver nanoparticles provides opaque printed images of excellent legibility
Data Source
AI summary
An inkjet ink, including (A) a resin, which is (A1) a terpene resin or (A2) a terpene phenol resin, (B) a solvent system including (B1) a volatile organic solvent having a boiling point of less than 100° C., and (C) silver nanoparticles. A printed article, including a substrate, and an opaque film disposed on the substrate. The opaque film is formed from the inkjet ink.