Ink Set Surface Tension Differential for Bleeding Control
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Solution Overview
Problem
High-speed inkjet printing on nonabsorbent or low-absorbency media, such as coated paper and plastic film, results in inadequate reduction of bleeding and color mixing between ink hues due to existing ink sets.
Innovation Solution
An ink set comprising a black pigment ink with a static surface tension of 20-40 mN/m and at least one pigment ink (magenta or yellow) with a static surface tension 0.1-0.7 mN/m lower, which limits movement and interaction between ink hues, reducing bleeding and color mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-speed inkjet printing is performed on nonabsorbent or low-absorbency media using conventional ink sets, then printing speed is improved, but bleeding and color mixing between ink hues increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the static surface tension of different ink compositions. Ink composition A (black) is formulated with a static surface tension of 20-40 mN/m, while ink composition B (magenta or yellow) is formulated with a static surface tension that is 0.1-0.7 mN/m lower than ink composition A. This surface tension differential creates a energy barrier that prevents ink spreading and color mixing at boundaries, enabling high-speed printing on nonabsorbent media while maintaining sharp color borders
2Productivity
If conventional ink sets are used for high-speed printing on nonabsorbent media, then productivity is improved, but ink quality deteriorates due to insufficient bleeding reduction
Solution Approach 1:
The patent changes the surface tension parameter of the ink formulations to resolve the contradiction between productivity and quality. By setting ink composition A at 20-40 mN/m and ink composition B at 0.1-0.7 mN/m lower, the system achieves both high-speed printing capability and superior printed article quality with minimal bleeding on nonabsorbent media
Solution Approach 2:
The patent uses composite material formulation by combining multiple components in each ink composition (pigment, solvent, surfactant, and other additives) to achieve the precise surface tension values required. The composite nature of these ink formulations allows simultaneous optimization of printing performance, drying characteristics, and color boundary control
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 set effectively minimizes bleeding and color mixing on various recording media, including nonabsorbent surfaces, by controlling the static surface tension of the inks to prevent excessive spreading and interaction.
Implementation Method 1
a black pigment ink (a) having a static surface tension (a1) of 20 mN/m to 40 mN/m and at least one pigment ink (b) selected from the group consisting of a magenta pigment ink and a yellow pigment ink, wherein a static surface tension of the pigment ink (b) is smaller than the static surface tension (a1) by 0.1 mN/m to 0.7 mN/m
Data Source
AI summary
The problem to be solved by the present invention is to provide an ink set that enables forming a printed article with reduced bleeding and color mixing. The present invention is an ink set that includes a black pigment ink (a) having a static surface tension (a1) of 20 mN/m to 40 mN/m and at least one pigment ink (b) selected from the group consisting of a magenta pigment ink and a yellow pigment ink. The static surface tension of the pigment ink (b) is smaller than static surface tension (a1) by 0.1 mN/m to 0.7 mN/m.