Inkjet dyeing method
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Solution Overview
Problem
Inkjet heads experience instability and nozzle omission during high-frequency ejection, particularly when using inks with disperse dyes containing coarse particles or high thixotropic indices, leading to satellite formation and defects in printed images.
Innovation Solution
An inkjet dyeing method utilizing an ink composition of disperse dye, dispersant, water, and water-soluble organic solvent, with specific particle size and dispersant ratios, and a drive signal phase difference between channel rows to minimize crosstalk and enhance ejection stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of nozzles and nozzle rows is increased to achieve faster and higher-definition recording, then recording speed and definition are improved, but crosstalk between pressure chambers increases causing droplet velocity instability
Solution Approach 1:
The common ink chamber is divided into multiple independent ink supply channels, with each pressure chamber row having its own dedicated ink supply path. This segmentation prevents pressure waves from propagating between different pressure chamber rows through the common ink chamber, thereby eliminating crosstalk while maintaining high nozzle counts for fast and high-definition recording.
2Productivity
If high ejection frequency is used to improve productivity, then output increases, but satellite formation and nozzle omission occur reducing image quality
Solution Approach 1:
The ink composition is pre-formulated with specific dispersants and controlled particle size distribution to maintain ink stability and prevent satellite formation before ejection occurs. This preliminary preparation of the ink ensures that even at high ejection frequencies, the ink maintains proper flow characteristics and droplet formation accuracy.
3Reliability
If ink containing disperse dye with coarse particles is used to achieve desired color properties, then color performance is improved, but satellite generation and ejection instability increase
Solution Approach 1:
The ink formulation parameters are optimized by controlling the particle size distribution of disperse dyes and adjusting the type and concentration of dispersants. This parameter optimization allows the ink to maintain stable ejection characteristics and prevent satellite formation while preserving the desired color performance properties.
4Device complexity
If pressure wave propagation is allowed in common ink chamber to maintain simple structure, then device complexity is reduced, but crosstalk between pressure chamber rows occurs
Solution Approach 1:
The common ink chamber is segmented into multiple independent supply channels, creating a moderate level of structural complexity that effectively isolates pressure waves between different pressure chamber rows while maintaining overall system efficiency and reliability.
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 method effectively suppresses satellite formation and nozzle omission, ensuring high-quality image production at high ejection frequencies by stabilizing droplet velocity and reducing crosstalk between channel rows.
Implementation Method 1
An inkjet head that generates pressure in a pressure chamber by the operation of a pressure-imparting means to discharge an ink inside the pressure chamber from a nozzle
Implementation Method 2
the pressure wave generated in the pressure chamber during discharge is propagated to a common ink chamber through the inlet side of the pressure chamber to affect other pressure chambers via the common ink chamber
Implementation Method 3
an inkjet dyeing method with an ink containing a disperse dye... An inkjet ink containing at least a disperse dye, a dispersant, water and a water-soluble organic solvent
Implementation Method 4
an ink having a high thixotropic index, satellites are likely to be generated
Data Source
Figure 1~2
Figure 3~4
Figure 5~6B
AI summary
Provided is an inkjet dyeing method for recording on fiber by ejecting an ink containing a disperse dye from an inkjet head. The inkjet head has two or more rows in which are aligned pressure chambers for generating pressure to discharge internal ink from a nozzle using a pressure applying means operated by the imparting of a drive signal. The pressure chambers are connected to each other through a shared ink chamber. The rows in which the pressure chambers are arranged are divided into N drive groups (where N is an integer of 2 or greater), and a phase difference of nAL+t is applied to drive signals applied to the pressure applying means of the pressure chambers in each drive group. n represents an integer of 1 or greater, AL represents 1/2 of an acoustic resonance period of a pressure wave in a pressure chamber, t represents a pressure wave transmission time period determined by dividing the distance between nozzles in a drive group by the speed at which sound propagates through the ink.