Inkjet Paper with Cationic Resin Coating for Anti-feathering
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Solution Overview
Problem
Existing plain paper type inkjet recording papers fail to achieve high anti-feathering property and ink drying property simultaneously, leading to issues with printing high-definition bar-codes and water resistance, especially at high speeds.
Innovation Solution
A plain paper type inkjet recording paper is developed using a base paper with rosette type precipitated calcium carbonate as a filler and a neutral rosin sizing agent, coated with a mixture containing a cationic resin and an anionic fluorescent dye, which enhances both anti-feathering and ink drying properties without an ink-receiving layer containing a pigment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a plain paper type inkjet recording paper without an ink-receiving layer containing a pigment is used, then the cost is reduced and the paper is simpler in structure, but the anti-feathering property and ink drying property are insufficient
Solution Approach 1:
The patent applies local quality by creating a sizing layer only on the surface of the base paper where ink contact occurs. This sizing layer contains cationic resin and internal sizing agents that provide localized anti-feathering and water-resistant properties, while the rest of the paper maintains its plain paper simplicity and low cost structure.
Solution Approach 2:
The patent uses composite materials by combining the base paper with a sizing layer containing cationic resin and internal sizing agents. This composite structure provides the necessary anti-feathering and ink drying properties on the surface while maintaining the overall simplicity and low cost of plain paper.
2Manufacturing precision
If the anti-feathering property is increased to prevent ink bleeding for high-definition bar-code printing, then the print quality improves, but the ink drying property may be compromised
Solution Approach 1:
The patent changes the chemical parameters of the sizing layer by using cationic resin with specific molecular weights and internal sizing agents with particular molecular structures. These parameter changes enable the sizing layer to provide both anti-feathering properties for sharp bar-code printing and adequate ink drying properties for high-speed printing.
Solution Approach 2:
The patent employs composite materials in the sizing layer by combining cationic resin with internal sizing agents. This composite composition allows the sizing layer to simultaneously provide anti-feathering effects for high-definition printing and maintain ink drying speed suitable for high-productivity applications.
3Productivity
If a coating layer containing pigment is added to improve ink reception and drying, then the ink drying property improves, but the paper structure becomes more complex and costly
Solution Approach 1:
The patent extracts the pigment component from the traditional ink-receiving layer while retaining the essential sizing functionality. By removing the pigment and keeping only the cationic resin and internal sizing agents in the sizing layer, the paper maintains ink drying properties without the added complexity and cost of a full ink-receiving layer.
Solution Approach 2:
The patent applies local quality by creating a simplified sizing layer without pigment only where needed for ink interaction. This localized approach provides adequate ink drying properties while avoiding the complexity of a complete ink-receiving layer with pigment across the entire paper structure.
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 provides high ink drying, anti-feathering, and water-resistant properties, enabling the production of high-definition bar-codes with improved printability and surface strength, suitable for high-speed inkjet printing.
Implementation Method 1
a coating mixture containing a cationic resin, an anionic fluorescent dye and a binder
Implementation Method 2
a neutral rosin sizing agent as an internal sizing agent
Implementation Method 3
an anionic fluorescent dye
Data Source
Figure 1
AI summary
An inkjet recording paper for use in a roll paper feed type printer having a printing speed of 100 m/min or more, comprising a base paper containing pulp, rosette type precipitated calcium carbonate as a filler, and a neutral rosin sizing agent as an internal sizing agent, wherein the base paper is coated with a coating mixture containing a cationic resin, an anionic fluorescent dye and a binder but no pigment; the inkjet recording paper having a Stockigt size degree according to JIS-P8122 of 10 to 25 seconds and an ash content according to JIS-P8251 of 13% to 25%.