Polyester Resin Treating Liquid for Sharp Printing on Low-Absorption Media
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Solution Overview
Problem
Existing technologies fail to provide ink with satisfactory adhesion properties and printed materials with sharpness and uniformity on low-liquid absorbing substrates such as coated papers and resin films, leading to image deterioration.
Innovation Solution
A treating liquid containing a polyester resin emulsion with controlled sulfonic acid group density and a specific solvent, applied to low-liquid absorbing substrates, enhances ink adhesion and improves image sharpness and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a treating liquid containing organic acid compounds with low pH is applied to a low-liquid absorbing substrate, then ink adhesion properties are improved, but pigment particles are flocculated causing deterioration in image sharpness and uniformity
Solution Approach 1:
The patent changes the pH parameter of the treating liquid from low (acidic) to neutral or slightly basic by using water-soluble polymer compounds instead of organic acid compounds. This parameter change prevents pigment flocculation while maintaining effective ink adhesion on low-liquid absorbing substrates.
Solution Approach 2:
The patent introduces water-soluble polymer compounds as intermediary substances that mediate between the substrate and ink. These polymers provide adhesion promotion without the harmful low pH effect, acting as a bridge that maintains both adhesion and image quality.
2Strength
If a treating liquid is applied to a low-liquid absorbing substrate, then ink adhesion is enhanced, but liquid components are not absorbed causing slow drying and potential smudging
Solution Approach 1:
The patent changes the chemical composition parameters of the treating liquid by using water-soluble polymer compounds with specific molecular structures that facilitate rapid evaporation. This allows the liquid components to dry quickly while the polymer provides sustained adhesion promotion.
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 treating liquid allows for excellent ink adhesion and high-quality image formation on low-liquid absorbing substrates, maintaining image sharpness and uniformity.
Implementation Method 1
there has been proposed an image-forming method for forming the printed characters or images in which by preliminarily applying a treating liquid containing a component capable of flocculating pigment particles contained in the ink onto a surface of the substrate, the pigment particles can be flocculated together
Data Source
AI summary
The present invention relates to a treating liquid containing a polyester resin (a) in the form of an emulsion thereof, in which the polyester resin (a) contains sulfonic acid groups, and a density of the sulfonic acid groups in the polyester resin (a) is not less than 0.1 mmol/g and not more than 0.8 mmol/g; a surface-treated low-liquid absorbing substrate including a surface treatment layer formed of the treating liquid; an ink set including the treating liquid; and an image-forming method using the treating liquid.