Pre-treatment Composition for High-Speed Inkjet Printing
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Solution Overview
Problem
Current inkjet printing technologies face challenges in achieving high-speed, high-resolution, and durable image printing due to limitations in ink composition and pre-treatment formulations, which affect image quality and stability on various media surfaces.
Innovation Solution
A printing method involving a pre-treatment composition with a liquid vehicle, a polyvalent metal salt as a fixing agent, and a latex resin with a specific glass transition temperature range, applied to the recording medium before an ink composition, allowing for enhanced ink immobilization and improved image quality, durability, and reduced bleeding and coalescence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional inkjet printing is used, then printing speed and resolution are improved, but image durability and stability on media surfaces deteriorate
Solution Approach 1:
A pre-treatment composition is applied to the media surface before inkjet printing to prepare the surface for better ink adhesion. This preliminary action modifies the media surface properties to enhance subsequent ink binding and image durability without affecting printing speed
Solution Approach 2:
The pre-treatment composition acts as an intermediary layer between the media surface and the ink composition. It contains components that interact with both the media and the ink to facilitate stable bonding, improving image durability while maintaining high-speed printing capability
2Reliability
If pre-treatment composition is applied to improve ink immobilization, then image quality and durability are improved, but printing process complexity increases
Solution Approach 1:
The pre-treatment composition is combined with the ink composition in a unified application process. The pre-treatment layer and ink are applied in sequence using integrated systems, merging two functional steps into a coordinated process that improves image stability without proportionally increasing operational complexity
Solution Approach 2:
The pre-treatment composition modifies media surface parameters such as surface energy, porosity, and chemical composition. These parameter changes enhance ink adhesion and image durability while the composition can be adjusted to optimize performance without significantly complicating the printing process
3Productivity
If conventional ink composition is used, then printing speed is maintained, but optical density and chroma quality deteriorate
Solution Approach 1:
The pre-treatment composition is applied beforehand to prepare the media surface for optimal ink deposition. This preliminary surface preparation enhances subsequent ink binding, improving optical density and chroma quality while maintaining high printing speed through efficient ink utilization
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 method enables high-quality, durable image printing at variable speeds, from 50 to 2000 feet per minute, with improved optical density, chroma, and resistance to abrasion and drying, specifically effective on slow-absorbing media like coated offset paper.
Implementation Method 1
interacts with the colorant and/or with polymeric components of the ink composition to thereby precipitate or, otherwise, fix the ink composition to the print media surface
Implementation Method 2
a latex resin having a glass transition temperature (Tg) ranging from −22° C. to 20° C.
Data Source
AI summary
Pre-treatment composition and printing method, for producing durable images, using it are disclosed. Said pre-treatment composition includes a liquid vehicle, a polyvalent metal salt as fixing agent, and a latex resin having a glass transition temperature (Tg) ranging from −22° C. to 20° C. Said method encompasses applying the pre-treatment composition onto a recording medium and applying an ink composition including an aqueous liquid vehicle and a colorant, over said pre-treatment composition, wherein the time interval between the finishing point of the application of the pre-treatment composition and between the starting point of the application of the ink composition is between 1 and 30 seconds.