Inkjet printing method
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Solution Overview
Problem
Current digital inkjet printing methods for fabrics are inefficient due to empiric setup processes that do not account for the specific features of the printed image, leading to non-homogeneous ink distribution and resulting in issues like peeling, discoloration, and wash-fastness problems, especially on dark substrates.
Innovation Solution
A method involving the use of functional compositions that are specifically determined based on the image's features, applied in conjunction with color ink compositions, using a look-up table generated from gradient pattern tests to optimize ink and functional agent distribution, ensuring uniformity and improved adhesion, wash-fastness, and hand-feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If empiric setup process is used for inkjet printing, then the printing process is simple to implement, but the image quality and functional properties become non-uniform
Solution Approach 1:
The patent applies local quality by determining the amount of functional composition to be printed on each portion of the image based on the specific amount of color ink composition in that portion. This ensures that each region receives the appropriate amount of functional agent to achieve uniform functional properties (adhesion, wash-fastness) across the entire image, rather than applying a uniform amount everywhere.
Solution Approach 2:
The patent changes the parameter of functional composition amount from a fixed value to a variable value that depends on the local ink coverage. By using a look-up table that maps ink amounts to corresponding functional composition amounts, the system dynamically adjusts the functional composition application to achieve consistent functional results across regions with varying ink densities.
2Device complexity
If uniform amount of functional composition is applied across the entire image, then the application process is simplified, but regions with sparse ink receive insufficient functional agent leading to poor adhesion and wash-fastness
Solution Approach 1:
The patent implements local quality by varying the amount of functional composition applied to different portions of the image based on their local ink coverage. Regions with sparse ink receive higher amounts of functional composition to ensure sufficient adhesion and wash-fastness, while regions with dense ink receive proportionally less, preventing over-application and maintaining overall uniformity of functional properties.
3Loss of time
If empiric setup is used without considering image features, then the printing process is faster to set up, but the result does not account for varying ink distribution across different image regions
Solution Approach 1:
The patent applies self-service by enabling the printing system to automatically analyze its own output (the amount of color ink in each portion) and adjust the functional composition application accordingly. The system uses the measured or calculated ink distribution data to determine the appropriate functional composition amounts, eliminating the need for external empiric adjustment while adapting to each image's specific features.
Data Source
AI summary
Provided herein is a method for digitally printing an image on a fabric in the form of a film on the surface of the fabric, such that the film is characterized by improved properties over the entire image. The method is implemented by compiling in a test run a look-up table for at least one functional composition that confers a desired property to the image, and using the look-up table for printing any given image using just the optimal amount of the functional composition and only on portions of the image that require improvement.