Cleaning Solution Hansen Solubility Parameter Optimization

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Solution Overview

Problem

Existing cleaning solutions are insufficient in cleaning power for inkjet printing heads when dealing with inks containing resins in amounts greater than 2% by mass, as they fail to effectively remove adhesions and maintain discharging stability.

Innovation Solution

A cleaning solution with a mixture solvent containing water and a solvent, where the hydrogen bond term of the Hansen solubility parameter is 7.0 (cal/cm3)1/2 or less, is used to improve cleaning efficacy for inks with resins at 5% by mass or greater, ensuring better discharging reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If pigment inks contain resins to secure high-speed drying property and fixability, then drying speed and fixability are improved, but ink adhesion and cohesion in printing heads increase, degrading discharging stability

Engineering Contradiction:

Improvedrying speedVSAvoiddischarging stability

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent changes the chemical parameters of the cleaning solution by specifying a hydrogen bond term of Hansen solubility parameter of 7.0 (cal/cm³)¹/² or less. This parameter optimization enables the cleaning solution to effectively dissolve resin-adhered ink while maintaining ink discharging stability during printing operations.

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If existing cleaning solutions are used to clean resin-containing ink, then general cleaning is performed, but cleaning power is insufficient for firmly adhered ink

Engineering Contradiction:

Improvecleaning solution compatibilityVSAvoidcleaning power

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent optimizes the chemical composition parameters of the cleaning solution by controlling the hydrogen bond term of Hansen solubility parameter to 7.0 (cal/cm³)¹/² or less. This parameter adjustment significantly enhances the cleaning power against firmly adhered resin-containing ink while maintaining compatibility with existing printing systems.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If cleaning power is increased to remove firmly adhered ink, then discharging stability is restored, but cleaning solution effectiveness against resin-adhered ink is insufficient

Engineering Contradiction:

Improvedischarging stabilityVSAvoidresin adhesion strength

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs a composite cleaning solution formulation that combines solvents with specific Hansen solubility parameters. This composite approach creates a synergistic effect that enhances the ability to dissolve firmly adhered resin-containing ink while maintaining system compatibility.

Inventive Principle:

Principle #40Composite materials

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 cleaning solution effectively cleans ink adhesions and maintains discharging stability by adjusting the Hansen solubility parameter, enhancing the cleaning power and reliability for inks with higher resin content.

Implementation Method 1

A hydrogen bond term of a Hansen solubility parameter of the mixture solvent is 7.0 (cal/cm3)1/2 or less

Methodology Applied

Scientific EffectHansen solubility parameter: Solvation

Data Source

PatentUS10040961B2Cleaning solution, set of ink and cleaning solution, cleaning solution stored container, inkjet printing apparatus, and inkjet printing method

Publication Date: 2018.08.07 RICOH CO LTD

AI summary

Provided is a cleaning solution used for cleaning an ink containing a resin in an amount of 5 percent by mass or greater, the cleaning solution including a mixture solvent containing water and a solvent, wherein a hydrogen bond term of a Hansen solubility parameter of the mixture solvent is 7.0 (cal/cm3)1/2 or less.