Print Medium With Charged Treatment Layer For Ink Fixation
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Solution Overview
Problem
Current inkjet printing technologies face challenges in achieving high-quality, durable prints with vivid color gamut and low ink bleed, particularly in high-speed printing, due to limitations in ink absorption and fixation on cellulose-based paper substrates.
Innovation Solution
A print medium comprising a cellulose-based paper substrate with an electrically charged treatment layer, an ink-absorbing layer containing surface-activated fumed silica particles, and an ink-receiving layer with amorphous silica and alumina particles, which enhances ink fixation and absorption, preventing ink bleed and promoting fast drying and high-quality image formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional inkjet printing is used on cellulose-based paper substrates, then printing speed can be maintained, but ink absorption and fixation are insufficient leading to ink bleed and poor image quality
Solution Approach 1:
The coating layer is divided into multiple functional layers: an electrically charged treatment layer for initial ink reception, an ink-absorbing layer with silica particles for rapid ink absorption, and an ink-receiving layer with alumina particles for ink fixation. This segmentation allows each layer to specialize in a specific function, resolving the contradiction between image quality and ink fixation reliability
Solution Approach 2:
The patent uses composite materials combining cellulose-based paper substrate with multiple coating layers containing different particles (silica, alumina) and polymers. This composite structure provides both the porosity needed for rapid ink absorption and the chemical properties for reliable ink fixation, simultaneously improving image quality and fixation reliability
2Manufacturing precision
If ink absorption is increased to prevent ink bleed, then image quality improves, but printing speed decreases due to longer drying time
Solution Approach 1:
The patent employs porous materials including silica particles and alumina particles with controlled pore structures. These porous materials provide rapid capillary action for ink absorption while maintaining sufficient porosity for quick drying. The porous structure allows ink to be quickly drawn into the coating layer and then evaporated, simultaneously improving image quality and maintaining high printing speed
Solution Approach 2:
Different regions of the coating layer have different properties: the electrically charged treatment layer provides initial ink reception, the ink-absorbing layer with silica particles provides rapid absorption, and the ink-receiving layer with alumina particles provides fixation. This local differentiation allows rapid drying in absorption zones while maintaining fixation quality, resolving the speed-quality contradiction
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 described print medium enables high-quality, durable prints with improved color gamut, black optical density, and low ink bleed, suitable for various ink types and printers, while supporting high-speed printing by effectively absorbing and fixing ink on the substrate.
Implementation Method 1
The first surface is treated with an electrically charged treatment layer
Implementation Method 2
An ink-absorbing layer is on the electrically charged treatment layer. The ink-absorbing layer includes a polymeric binder and surface-activated fumed silica particles
Implementation Method 3
An ink-receiving layer is on the ink-absorbing layer. The ink-receiving layer includes amorphous silica particles, alumina particles, or a combination thereof
Data Source
AI summary
A print medium can include a cellulose-based paper substrate with a first surface and a second surface opposite the first surface. The first surface can be treated with an electrically charged treatment layer. An ink-absorbing layer can be positioned on the electrically charged treatment layer. The ink-absorbing layer can include a polymeric binder and surface-activated fumed silica particles. The surface-activated fumed silica particles can include fumed silica particles that are surface-activated with charged multivalent aluminum salt and organosilane reagent. In further detail, an ink-receiving layer can be positioned on the ink-absorbing layer. The ink-receiving layer can include amorphous silica particles, alumina particles, or a combination thereof.