Ink jet recording apparatus and ink jet textile printing method
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Solution Overview
Problem
Ink jet recording methods face challenges in achieving high whiteness and washing fastness on dark fabrics while maintaining discharge stability, as high concentrations of white pigments and resin particles can lead to precipitation and reduced texture.
Innovation Solution
An ink jet recording apparatus with a liquid jet head featuring a circulation return passage and a textile printing ink composition containing resin particles with a glass transition temperature below 6°C and a white pigment concentration of 5% or more, which circulates within the pressure chamber to prevent clogging and improve discharge stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the white pigment concentration is increased to achieve high whiteness, then the whiteness of printed fabric is improved, but the discharge stability of the ink composition deteriorates due to precipitation
Solution Approach 1:
The patent changes the chemical parameters of the ink composition by specifying precise proportions of white pigment (5-20 mass%), resin particles (5-20 mass%), and water (70-85 mass%). It also controls the glass transition temperature of resin particles to be less than 6°C, which fundamentally alters the physical-chemical properties to enable high whiteness while maintaining discharge stability and preventing precipitation.
Solution Approach 2:
The patent creates a composite ink composition system combining white pigment particles, resin particles with specific glass transition temperature, and water in controlled proportions. This composite formulation ensures that the white pigment remains suspended stably while achieving high whiteness on dark fabrics, resolving the contradiction between concentration and stability.
2Reliability
If resin particles are added to improve washing fastness, then the washing fastness properties are increased, but the texture of printed fabric becomes hard
Solution Approach 1:
By controlling the glass transition temperature of resin particles to be less than 6°C, the patent ensures that the resin remains flexible and soft at ambient and washing temperatures. This parameter control allows the resin to bind pigment particles effectively for washing fastness while maintaining a soft, flexible texture on the printed fabric surface.
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 enables the production of printed materials with excellent washing fastness and texture while maintaining high whiteness, even with increased white pigment concentrations, by preventing clogging and ensuring stable ink discharge.
Implementation Method 1
a circulation return passage enabling the ink composition in the pressure chamber to circulate
Implementation Method 2
the resin particles have a glass transition temperature of less than 6° C.
Data Source
AI summary
An ink jet recording apparatus includes an ink composition and a liquid jet head including a nozzle for discharging the ink composition. The ink composition is a textile printing ink composition containing resin particles, a white pigment, and water. The content of the resin particles is 5.0 mass % or more based on the total amount of the ink composition. The content of the white pigment is 5.0 mass % or more based on the total amount of the ink composition. The resin particles have a glass transition temperature of less than 6° C. The liquid jet head includes a pressure chamber to which the ink composition is supplied and a circulation return passage enabling the ink composition in the pressure chamber to circulate.