Ink Jet Recording With Aqueous Ink to Reduce Duplex Roller Transfer
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Solution Overview
Problem
Ink jet recording methods face issues with ink transfer to transport rollers and contamination during double-sided printing due to insufficient ink permeation and drying, leading to ejection stability and clogging problems.
Innovation Solution
An ink composition containing a pigment, acetylene glycol-based surfactant, lactam compound with a six- to eight-membered ring, water-soluble urethane resin, and water as solvent, combined with a transport roller design to minimize ink transfer and enhance permeability and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If double-sided printing is performed by transporting the recording medium through a transport roller immediately after ink ejection, then printing efficiency is improved, but ink transfers to the transport roller causing contamination and ejection stability deterioration
Solution Approach 1:
The patent introduces a pre-drying step before the recording medium contacts the transport roller. By providing a drying section with drying rollers that apply heat and pressure to partially dry the ink before transport, the ink becomes less transferable to the transport roller, thus preventing contamination while maintaining high-speed double-sided printing capability
Solution Approach 2:
The patent introduces a drying section with drying rollers as an intermediary between the ink ejection section and the transport roller. This intermediary component performs partial drying of the ink, creating a transition state that prevents direct ink transfer to the transport roller while allowing continuous high-speed processing
2Productivity
If the recording medium is transported quickly for high-speed printing, then productivity is improved, but ink does not sufficiently dry causing transfer to transport roller and contamination
Solution Approach 1:
The patent applies preliminary drying action through drying rollers that heat and press the recording medium before it reaches the transport roller. This pre-treatment reduces ink transferability without requiring slow transport speeds, thus maintaining high productivity while preventing contamination
Solution Approach 2:
The patent changes the physical parameters of the ink by applying heat and pressure through drying rollers, transforming the ink from a wet, transferable state to a partially dried, less transferable state. This parameter change allows high-speed transport without ink transfer contamination
3Object-affected harmful factors
If ink composition is optimized for rapid drying, then transfer resistance is improved, but ejection stability and clogging recoverability deteriorate
Solution Approach 1:
The patent applies different functional components to different aspects of the ink composition: acetylene glycol-based surfactant for rapid drying and transfer resistance, lactam compound for ejection stability, and water-soluble urethane resin for clogging recoverability. This localized optimization of different ink properties resolves the contradiction between rapid drying and ejection stability
4Productivity
If transport roller contact is used for double-sided printing, then printing efficiency is improved, but ink adheres to the contact face causing contamination of subsequent recording media
Solution Approach 1:
The patent applies preliminary drying through drying rollers before the recording medium contacts the transport roller for double-sided printing. This pre-drying prevents ink from adhering to the transport roller surface, eliminating the source of contamination for subsequent recording media while maintaining efficient double-sided printing
Solution Approach 2:
The drying section with drying rollers serves as an intermediary that processes the recording medium between ink ejection and transport roller contact. This intermediary drying step prevents the harmful interaction between wet ink and the transport roller, eliminating contamination of subsequent media
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 improved clogging recoverability, transfer resistance, and storage stability, enabling high-speed double-sided printing without ink contamination and roller clogging.
Implementation Method 1
insufficient ink permeation
Implementation Method 2
drying the ink within 0.4 seconds after the ink adheres to a recording medium
Data Source
AI summary
An ink jet recording method includes a first adhesion step of ejecting an ink composition from an ink jet head to cause the ink composition to adhere to one face of a recording medium, a feeding step of transporting the recording medium by a transport roller to feed another face as a face opposite the one face subjected to the first adhesion step to a position facing the ink jet head, and a second adhesion step of ejecting the ink composition from the ink jet head to cause the ink composition to adhere to the other face fed. The ink composition contains a pigment, an acetylene glycol-based surfactant, a lactam compound having a lactam ring as a six- to eight-membered ring, a solvent component, and a water-soluble urethane resin dissolved in the solvent component. The solvent component contains water, and the ink composition is an aqueous ink.