Varnish Composition for Solid Ink Jet Print Robustness
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Solution Overview
Problem
Solid ink jet prints are prone to rubbing and scratching due to poor bonding between the ink and substrate, resulting in unsatisfactory image robustness compared to toner prints, as the printing process applies minimal pressure, leading to the ink sitting on top of the substrate rather than diffusing into it.
Innovation Solution
A varnish composition comprising a latex emulsion, water, a base, and a surfactant is applied to the ink image, adjusting the surface tension and viscosity to enhance bonding and robustness, which may include optional additives like coalescing aids and anti-foaming agents to improve film formation and substrate adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating is applied over the print to form a protective barrier, then the robustness of the print is increased, but the complexity of the manufacturing process increases
Solution Approach 1:
The patent modifies the chemical parameters of the coating formulation by incorporating specific latex emulsions with controlled glass transition temperatures (30-95°C), surfactants for surface tension control, and bases for pH adjustment. These parameter changes enable the coating to achieve optimal bonding with the ink image at controlled temperatures without requiring complex additional processing equipment
Solution Approach 2:
The patent creates a composite coating system by combining multiple components: latex emulsion (for film formation and adhesion), surfactant (for surface wetting), base (for pH control and stability), and optional coalescing aids (for low-temperature film fusion). This composite formulation achieves enhanced print robustness through synergistic interactions among components while maintaining manufacturing simplicity
2Productivity
If the ink sits on top of the substrate without diffusion, then the printing process is simple and fast, but the bonding between ink and substrate is poor
Solution Approach 1:
The patent introduces a specially formulated coating as an intermediary layer between the ink image and the substrate. This coating contains latex emulsion particles that can bond to both the ink components and the substrate surface, creating a bridging effect that enhances adhesion without requiring the ink to diffuse into the substrate, thus maintaining printing speed while improving bonding
Solution Approach 2:
The patent changes the surface energy parameters of the substrate-coating interface by incorporating surfactants in the coating formulation. This modifies the wettability and adhesion characteristics, enabling strong bonding between the coating and ink image without requiring thermal or mechanical treatment that would slow down the printing process
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 varnish composition effectively increases the scratch resistance and robustness of solid ink jet prints by improving the bonding between the ink and substrate, providing a protective barrier that enhances the durability of the printed images.
Implementation Method 1
adjusting the surface tension and viscosity of the varnish composition
Implementation Method 2
at least one latex emulsion
Data Source
AI summary
A recording medium with an ink image thereon, wherein a varnish at least partially covers the ink image, and wherein the varnish composition prior to application comprises at least one latex emulsion, water, at least one base and at least one surfactant.