Recording Sheet Ink Transfer via Divalent Salt
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Solution Overview
Problem
Conventional recording sheets for printing, particularly in ink jet processes, face issues with ink transfer, image dry time, and edge acuity, which affect print quality and efficiency.
Innovation Solution
A recording sheet comprising lignocellulosic fibers with a water-soluble divalent metal salt, such as calcium chloride, and starches, applied in a specific amount and distribution to achieve a Hercules Sizing Test Value that limits ink transfer to 60% or less, enhancing image dry time, print density, and edge acuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional recording sheets are used, then ink transfer is high, but image dry time is prolonged
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the recording sheet - specifically incorporating water-soluble divalent metal salts (such as calcium chloride, magnesium sulfate) at controlled concentrations (0.1-5% by weight). This chemical parameter modification enables the sheet to control ink transfer while maintaining appropriate drying characteristics, resolving the contradiction between reduced ink transfer and acceptable image dry time
Solution Approach 2:
The patent uses composite materials by combining lignocellulosic fibers with water-soluble divalent metal salts and optional starch or polymer emulsion additives. This composite structure creates a recording sheet that simultaneously achieves reduced ink transfer (through the metal salt component) and controlled drying properties (through the fiber matrix and optional additives), thereby resolving the technical contradiction
2Manufacturing precision
If ink transfer is reduced, then image quality improves, but print density may be affected
Solution Approach 1:
The patent employs parameter changes by precisely controlling the concentration of water-soluble divalent metal salts (0.1-5% by weight) and the Hercules Sizing Test Value (5-100 seconds) to achieve optimal balance between ink transfer reduction and print density maintenance. The specific parameter range ensures sufficient ink retention for density while limiting excessive transfer that would harm edge acuity
Solution Approach 2:
The patent applies local quality by creating a surface treatment layer with water-soluble divalent metal salts that selectively interacts with ink at the paper surface. This localized treatment (at the surface rather than throughout the bulk) allows differential control: limiting ink transfer at edges for sharpness while maintaining adequate ink retention in image areas for proper density
3Object-generated harmful factors
If water soluble divalent metal salt is added, then ink transfer is controlled, but sheet complexity increases
Solution Approach 1:
The patent uses parameter changes by establishing specific concentration ranges (0.1-5% by weight of divalent metal salt) and performance targets (HST value of 5-100 seconds) that simplify the formulation process. Rather than requiring complex multi-component systems, the invention achieves ink transfer control through a relatively simple parameter specification, reducing compositional complexity while maintaining effectiveness
Solution Approach 2:
The patent extracts the essential function of ink transfer control to a single key component - water-soluble divalent metal salts - rather than requiring complex combinations of multiple additives. By identifying and utilizing this specific functional component, the invention simplifies the overall sheet composition while achieving the desired ink transfer control, thereby reducing complexity
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 solution significantly improves image dry time, print density, and edge acuity, resulting in better print quality and reduced ink transfer, making the recording sheet more suitable for ink jet printing processes.
Implementation Method 1
a water soluble divalent metal salt preferably on at least one surface of the substrate; wherein the Hercules Sizing Test Value ("HST") of the substrate and the amount of divalent salt are selected such that the recording sheet has a percent ink transferred ("IT%") equal to or less than about 60
Data Source
AI summary
This invention is directed to an recording sheet having improved image dry time for use in printing comprising a substrate having in contact with at least one surface thereof one or more water soluble divalent metal salts, preferably admixed with one or more starches, to process of forming such recording sheet, to a method of generating one or more image(s) on said recording sheet in an printing process and to a recording sheet having one or more images on a surface thereof.