Ink Receptive Layer for High-Speed Inkjet Web Press
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Solution Overview
Problem
High-speed inkjet web press printing faces challenges such as ink bleed, poor optical density, slow dry time, and image strike-through due to inadequate ink absorption and durability of conventional media, particularly in cost-sensitive applications like printing textbooks.
Innovation Solution
An improved media with a paper substrate coated on one or both sides with an ink receptive layer containing inorganic particles, a binder, a water-soluble metallic salt, a colorant durability enhancer, and a coefficient of friction reducer, which enhances dry rub durability and wet wipe resistance without the need for additional overcoats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If silica-based coating is used to reduce ink bleed and strike-through, then image quality is improved, but manufacturing cost increases significantly
Solution Approach 1:
The patent changes the chemical composition parameters of the coating by incorporating water-soluble metallic salts (such as aluminum sulfate, ferric chloride, or zinc chloride) that react with ink components to form insoluble precipitates. This chemical parameter change enables the coating to achieve ink fixation and bleed prevention without requiring expensive silica-based materials, thus resolving the contradiction between image quality and manufacturing cost
Solution Approach 2:
The patent creates a composite coating system combining organic binders (such as starch, gelatin, or synthetic resins) with inorganic metallic salts. This composite material approach provides both the adhesion and ink-reactive properties needed for high-quality printing while using cost-effective components, eliminating the need for expensive silica-based coatings
2Ease of manufacture
If clay coating is used to reduce manufacturing cost, then manufacturing cost decreases, but dry rub durability and print quality deteriorate
Solution Approach 1:
The patent modifies the surface properties of clay particles by treating them with water-soluble metallic salts that create a chemical interaction layer. This parameter change transforms the clay surface from smooth and ink-repelling to chemically reactive and ink-binding, enabling clay-based coatings to achieve both low cost and high print quality simultaneously
Solution Approach 2:
The water-soluble metallic salts act as intermediary substances between the clay coating and the ink. These salts form a reactive interface that binds ink components to the clay surface, mediating the interaction to achieve durable prints on cost-effective clay-based media
3Productivity
If conventional coated media is used for high-speed printing, then printing speed increases, but ink absorption and dry time performance worsen
Solution Approach 1:
The patent incorporates porous structures within the coating matrix, creating capillary networks that rapidly absorb ink droplets. The water-soluble metallic salts are distributed within this porous structure, ensuring both quick ink uptake and effective ink fixation, thereby enabling high-speed printing without sacrificing absorption performance
Solution Approach 2:
The coating is pre-treated with water-soluble metallic salts during the coating process, creating pre-formed reactive sites before printing occurs. This preliminary action ensures that when ink contacts the media at high speed, the reactive sites are already in place to immediately bind the ink, eliminating the delay between ink deposition and ink fixation
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 improved media exhibits excellent dry rub durability, strong wet wipe resistance, and quick ink absorption, maintaining image quality and integrity even under mechanical stress and liquid exposure.
Implementation Method 1
enhances dry rub durability and wet wipe resistance without the need for additional overcoats
Implementation Method 2
The ink receptive layer includes inorganic particles, at least one binder, a water-soluble metallic salt
Implementation Method 3
a coefficient of friction (COF) reducer, which enhances dry rub durability and wet wipe resistance
Implementation Method 4
The ink receptive layer includes inorganic particles, at least one binder
Implementation Method 5
a colorant durability enhancer, and a coefficient of friction (COF) reducer, which enhances dry rub durability and wet wipe resistance
Data Source
AI summary
A media suitable for inkjet web press printing is disclosed herein. The media includes a paper substrate and an ink receptive layer coated onto at least one surface of the paper substrate. The ink receptive layer includes: inorganic pigments; at least one water-based binder; a water-soluble metallic salt; a colorant durability enhancer selected from the group consisting of boric acid, borax, sodium tetraborate, phenyl boronic acid, butyl boronic acid and combinations thereof; and a coefficient of friction (COF) reducer selected from the group consisting of polyethylene wax, paraffin wax, carnauba wax, polypropylene wax, polytetrafluoroethylene wax, and combinations thereof.