Inkjet-textile printing method
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Solution Overview
Problem
Inkjet textile printing on light-colored fabrics faces challenges in maintaining texture and improving tackiness and image quality, particularly when a solid image is printed with a white ink followed by a chromatic color ink, unless optimal ink compositions and printing conditions are used.
Innovation Solution
An inkjet textile printing method involving pretreatment with a solution containing a polyvalent metal salt and water-dispersible resin, followed by application of a white ink composition with a specific ratio of white pigment and water-dispersible resin, and then a chromatic color ink composition, where the white ink application is 3.0 to 13.0 times the chromatic color ink by solid content mass ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a solid image is printed with white ink followed by chromatic color ink on light-colored fabric, then image density and chroma are improved, but tackiness deteriorates and texture is compromised
Solution Approach 1:
The patent applies parameter changes by controlling the glass transition temperature of the water-dispersible resin within a specific range (-50°C to 0°C) and optimizing the white ink application amount to 3.0-13.0 times relative to chromatic ink. This resolves the contradiction by adjusting material parameters to achieve both high image density and reduced tackiness simultaneously
Solution Approach 2:
The patent uses composite materials by formulating the white ink composition with specific components including water-dispersible resin, white pigment, and auxiliary agents in optimized proportions. This composite approach allows the ink to provide both sufficient coverage for image density and controlled drying properties to minimize tackiness
2Manufacturing precision
If white ink is applied in large amounts to form a solid image on light-colored fabric, then chroma and image quality are improved, but the texture of the textile deteriorates
Solution Approach 1:
The patent resolves this contradiction by changing the parameter of glass transition temperature of the water-dispersible resin to within -50°C to 0°C, which optimizes the balance between ink film formation for chroma and flexibility to maintain textile texture
Solution Approach 2:
The patent applies dynamics by making the white ink application amount variable (3.0-13.0 times relative to chromatic ink) rather than fixed, allowing optimization for both chroma and texture preservation depending on specific printing conditions
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 results in high-quality printed textiles with improved chroma, optical density, and maintained texture, along with reduced tackiness.
Implementation Method 1
a water-dispersible resin having a glass transition temperature of -25°C or higher
Implementation Method 2
applying by inkjet a white ink composition containing a white pigment, a water-dispersible resin having a glass transition temperature of -25°C or higher, and water
Data Source
AI summary
An object is to maintain a chroma and an OD value of a printed image of a printed textile and a texture of the printed textile and to improve tackiness when an image is printed on a light-colored cloth by an inkjet textile printing method. As a solution, an inkjet textile printing method including steps A to C in this order is provided: a step A of preparing a light-colored textile pretreated with a pretreatment solution; a step B of applying by inkjet a white ink composition containing a white pigment, a water-dispersible resin, and water, to the pretreated light-colored textile; and a step C of applying by inkjet a chromatic color ink composition containing a chromatic color pigment, a water-dispersible resin, and water, onto an ink layer formed by the application of the white ink composition, in which an application amount of the white ink composition per unit area in an application region of the white ink composition is 3.0 to 13.0 times relative to an application amount of the chromatic color ink composition per unit area in an application region of the chromatic color ink composition in terms of solid content mass ratio.