Ink Composition Durability via Latex Coalescence and Fuser Heat
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Solution Overview
Problem
Inkjet printing technologies face challenges in achieving durability comparable to laser printing, particularly with regards to image smear, finger smudge, and decap performance, especially when enhancing ink compositions with durability-enhancing polymers.
Innovation Solution
An ink composition comprising carbon black pigment, water, organic solvent, free latex particles, C10 to C20 fatty acid, and lithium, optionally including polyurethane, which can be surface-treated and combined with a fuser device applying heat and pressure to enhance print durability and decap performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If durability-enhancing polymers are added to ink composition, then image durability is improved, but decap performance deteriorates
Solution Approach 1:
The patent modifies the chemical parameters of the polymer by incorporating specific functional groups (carboxylic acid, hydroxyl, amine) and controlling molecular weight and composition to achieve both durability and decap performance simultaneously
Solution Approach 2:
The patent uses composite polymer structures combining different functional segments - one providing durability (e.g., hydrophobic chains) and another providing decap performance (e.g., hydrophilic or ionic groups) - to resolve the contradiction between these opposing requirements
2Reliability
If heat and pressure are applied to enhance print durability, then image smear resistance is improved, but nozzle health deteriorates
Solution Approach 1:
The patent incorporates preliminary protective agents in the ink composition that prepare and protect the nozzle surface before heat and pressure application, preventing damage while enabling durability enhancement
Solution Approach 2:
The patent uses intermediary substances (surfactants, protective polymers) that mediate between the nozzle and the heat/pressure process, allowing durability enhancement without direct harmful contact to the nozzle
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 composition achieves near-laser-like durability and improved decap performance, maintaining nozzle health and print quality under heat and pressure, effectively addressing the limitations of traditional inkjet printing.
Implementation Method 1
a fuser device. The fuser device can include a heated roller
Implementation Method 2
The fuser device can include a heated roller and a back roller. The heated roller can contribute to providing heat and pressure to the print medium
Data Source
AI summary
An ink composition can include carbon black pigment, from 50 wt % to 80 wt % water, from 15 wt % to 35 wt % organic solvent, from 0.25 wt % to 9 wt % free latex particles having an average particles size from 50 nm to 500 nm, from 0.1 wt % to 1 wt % C10 to C20 fatty acid, and lithium.