Primer Composition for Offset Media Inkjet Printing
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Solution Overview
Problem
Inkjet printing on offset media surfaces results in poor image quality, slow drying, and poor durability due to the hydrophobic and non-porous nature of these surfaces, which are not suitable for water-based inks, leading to issues with dry and wet smearfastness.
Innovation Solution
A primer composition is applied to the media substrate, comprising polyvinyl alcohol, starch nanoparticles, and a polyurethane dispersion, along with a cationic salt, to enhance the interaction with water-based inks, improving both dry and wet smearfastness and maintaining high-speed printing without compromising print quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If offset coated paper with hydrophobic polymer coating is used for inkjet printing, then the media is suitable for conventional offset printing, but water-based inks exhibit poor image quality, slow drying, and poor durability
Solution Approach 1:
A primer composition serving as an intermediary layer is applied between the hydrophobic offset media and water-based inks. The primer contains hydrophilic components that interact favorably with water-based inks, while also adhering to the offset media surface, thus mediating the incompatible interactions between hydrophobic media and hydrophilic inks
Solution Approach 2:
The surface properties of the offset media are chemically modified by applying a primer composition that changes the surface energy, porosity, and hydrophilicity parameters. This allows the previously hydrophobic and non-porous surface to become receptive to water-based inks with improved drying and durability characteristics
2Productivity
If high-speed inkjet printing is performed on offset media, then productivity increases, but image quality and smearfastness deteriorate
Solution Approach 1:
The primer composition is applied in advance to the offset media before inkjet printing. This preliminary action prepares the surface with appropriate porosity and surface energy characteristics, enabling high-speed printing to proceed without compromising image quality or smearfastness
3Shape
If conventional offset media coating is used, then the surface is smooth and non-porous for offset printing, but water-based inks cannot penetrate and dry slowly
Solution Approach 1:
The primer composition introduces a porous structure to the otherwise non-porous offset media surface. The primer contains particles and polymers that create interconnected voids and channels, allowing water-based inks to penetrate and dry rapidly while maintaining surface smoothness for quality printing
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 primer composition ensures instant dry and wet smearfastness, preventing image smearing during rewinding, allowing high-speed printing without additional drying time, and maintaining print quality by forming a durable ink-receiving layer on offset media.
Implementation Method 1
aqueous liquids... difficult to penetrate
Implementation Method 2
polyvinyl alcohol... cationic salt... enhance the interaction with water-based inks
Implementation Method 3
polyvinyl alcohol... cationic salt... enhance the interaction with water-based inks
Data Source
AI summary
The present disclosure is drawn to primer compositions, which can include a binder including polyvinyl alcohol, starch nanoparticles, and a crosslinkable polyurethane dispersion. The primer competitions can also include a cationic salt and water.