Dye-sublimation inkjet printing for textile
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Solution Overview
Problem
Current dye-sublimation printing methods require a transfer medium and chemical pretreatment, which complicates the process, limits usability, and results in uneven sublimation and absorption, especially on non-flat or dynamic surfaces like activewear, and direct inkjet printing with dye-sublimation inks faces challenges with ink mobility and feathering due to the absence of film-forming agents and binders.
Innovation Solution
A dye-sublimation printing process using a direct inkjet methodology without a transfer medium or substrate pretreatment, where a dye-sublimation ink composition with a property-sensitive agent coagulates upon contact with a property-adjusting agent on the substrate, forming a confined dot that sublimates and penetrates the fibers, eliminating the need for film-forming agents and improving print quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If direct inkjet printing is used with dye-sublimation inks on absorptive substrates, then the printing process is simplified and substrate pretreatment is eliminated, but ink mobility and feathering increase due to absence of film-forming agents
Solution Approach 1:
The patent introduces an agent treatment layer as an intermediary between the inkjet-printed dye and the absorptive substrate. This layer prevents direct absorption of liquid dye into the substrate, thereby preventing feathering and soaking while maintaining the simplicity of direct inkjet printing without requiring substrate pretreatment.
Solution Approach 2:
The agent treatment layer is applied to the substrate before inkjet printing to pre-establish a barrier that controls dye absorption. This preliminary action ensures that when the dye is printed, it will not feather or soak into the substrate, thus maintaining image quality from the outset.
2Manufacturing precision
If transfer medium is used in dye-sublimation printing, then uniform dye transfer is achieved, but process complexity increases and usability on non-flat surfaces is limited
Solution Approach 1:
The patent extracts and eliminates the transfer medium from the traditional dye-sublimation process. By directly printing dye onto the absorptive substrate with the agent treatment layer, it removes the intermediate transfer paper step, thereby simplifying the process while maintaining dye transfer uniformity through the controlled absorption mechanism.
Solution Approach 2:
The absorptive substrate with agent treatment layer serves itself by directly receiving and uniformly absorbing the printed dye without requiring an external transfer medium. The substrate's own absorption properties, when controlled by the agent layer, enable uniform dye transfer directly from the inkjet print.
3Manufacturing precision
If chemical pretreatment is applied to substrate, then ink absorption is controlled, but substrate quality deteriorates and costs increase
Solution Approach 1:
The agent treatment layer acts as an intermediary that controls ink absorption without chemically modifying the substrate itself. This layer provides the necessary absorption control while leaving the substrate's original quality and composition intact, avoiding the degradation associated with chemical pretreatments.
4Ease of manufacture
If dye-sublimation ink is printed directly on absorptive substrate without agent treatment layer, then process is simpler, but uneven sublimation and absorption occur
Solution Approach 1:
The agent treatment layer serves as a mediator that enables uniform sublimation and absorption while maintaining process simplicity. It provides the controlled interaction between the printed dye and substrate, ensuring even dye distribution and uptake without complicating the overall printing process.
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
This approach simplifies the printing process, enhances image quality by preventing soaking and feathering, and maintains the quality of dye-sublimation prints on untreated absorptive substrates, including textiles, while reducing costs and overcoming limitations of traditional methods.
Implementation Method 1
a dye-sublimation ink composition with a property-sensitive agent coagulates upon contact with a property-adjusting agent on the substrate
Implementation Method 2
forming a confined dot that sublimates and penetrates the fibers
Implementation Method 3
The heat imparted by the heat press heats the transfer medium and the fabric to approximately 200° C., causing the image on the transfer medium to be transferred to the fabric by sublimation
Data Source
AI summary
Provided herein is an inkjet dye-sublimation ink composition that is formulated to interact with an immobilizing composition such that the ink composition coagulates on the surface of an absorptive substrate, thereby substantially limiting soaking of the ink composition into the substrate. Also provided are a printing process and a printing machine, wherein the ink composition is directly printed on the substrate concomitantly with the immobilizing composition, and thereafter undergo heat-pressing to afford a dye-sublimation transfer of the dye to the substrate, thereby forming an image which is characterized by sharp and well defined edges of the dyed areas.