Terpene Resin Solvent-Based Inkjet Formulation for Long Throw
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Solution Overview
Problem
Thermal inkjet printing faces challenges with poor image quality due to inadequate throw distance and reliability issues, particularly when printing on complex substrates, and suffers from short decap times leading to printhead clogging.
Innovation Solution
Inkjet inks formulated with a terpene resin and a solvent system comprising a ketone solvent with a boiling point below 120°C and dioxolane, which enhance decap time and allow printing at long throw distances up to 15 mm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If thermal inkjet printing is used with conventional ink formulations, then high print resolution at lower cost is achieved, but throw distance is limited to 1-2 mm resulting in poor image quality on complex substrates
Solution Approach 1:
The patent modifies the physical and chemical parameters of the ink formulation, specifically using a terpene resin binder with a solvent system containing ketone and dioxolane in controlled ratios. This changes the ink's volatility, surface tension, and drying characteristics to enable stable jetting at extended throw distances of 5-15 mm while maintaining image quality on complex substrates
Solution Approach 2:
The invention creates a composite ink formulation by combining terpene resin with a specific solvent mixture of ketone (30-70 wt%) and dioxolane (10-40 wt%). This composite material structure provides the unique properties needed to overcome the throw distance limitation of conventional thermal inkjet inks while maintaining reliability and image quality
2Reliability
If conventional solvent-based inkjet inks are used, then acceptable decap times are achieved, but printhead clogging occurs after prolonged exposure to air
Solution Approach 1:
The patent adjusts the volatility parameters of the solvent system by selecting ketone and dioxolane with specific boiling points and evaporation rates. This creates an optimized balance where the ink remains stable in the printhead for extended decap times (preventing clogging) while still drying quickly after application to complex substrates, thereby improving reliability without sacrificing performance
3Reliability
If ink formulations are optimized for long decap times, then reliability improves, but throw distance performance deteriorates
Solution Approach 1:
The patent performs multi-parameter optimization of the ink formulation, adjusting the resin type, solvent composition, and their ratios to achieve a balanced performance profile. The specific combination of terpene resin with ketone (30-70 wt%) and dioxolane (10-40 wt%) creates an ink that simultaneously achieves extended decap times for reliability and sufficient throw distance (5-15 mm) for complex substrate printing
Solution Approach 2:
The invention develops a composite ink system where the interaction between terpene resin and the dual-solvent system (ketone + dioxolane) creates synergistic effects. This composite formulation achieves both long decap times and extended throw distance performance, resolving the trade-off between reliability and throw distance capability
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 ink formulation provides extended decap times and enables high-quality printing on complex substrates with improved reliability and image clarity at extended throw distances.
Implementation Method 1
a solvent system that includes (B1) a ketone solvent having a boiling point of less than 120 °C and (B2) dioxolane
Implementation Method 2
the print cartridges contain a series of tiny chambers, each containing a heater, which produce ink droplets from thermal vaporization of an ink solvent
Data Source
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AI summary
An inkjet ink that includes (A1) a terpene resin, and (B) a solvent system containing (B1) a ketone solvent having a boiling point of less than 120 °C and (B2) dioxolane, the inkjet ink being characterized by extended decap times and long throw distance. A printed article including the inkjet ink in dried form, and a method of forming a printed image with a thermal inkjet printhead are also provided.