Crystalline Seed Layer for Phase Change Ink Solidification
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Solution Overview
Problem
Current phase change ink technologies face challenges in achieving rapid ink solidification on various substrates while maintaining image quality and robustness, leading to inefficiencies in printing processes.
Innovation Solution
The method involves applying a first crystalline compound on a substrate to form nucleation sites, allowing for the rapid crystallization of a second crystalline compound-based ink, which significantly reduces the ink solidification time without compromising image quality or robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional phase change ink is used without nucleation sites, then the ink remains stable during storage and handling, but the ink solidification time is prolonged and image quality deteriorates
Solution Approach 1:
The patent applies a crystalline seed layer to the substrate before ink deposition, creating pre-formed nucleation sites that enable rapid crystal growth when the ink is applied. This preliminary preparation eliminates the induction period required for spontaneous nucleation, reducing solidification time from minutes to seconds while maintaining ink stability during storage since the seed layer is inert until activated by ink contact
2Duration of action of stationary object
If conventional phase change ink is used without nucleation sites, then the ink can be handled and stored indefinitely, but the print density and image quality are reduced
Solution Approach 1:
The crystalline seed layer acts as an intermediary between the substrate and the phase change ink, providing a controlled interface that promotes uniform and rapid crystallization. This intermediary layer ensures consistent nucleation across the substrate surface, leading to uniform print density and improved image quality while the ink maintains its long-term storage stability
3Ease of operation
If the ink is allowed to solidify slowly without nucleation sites, then the ink has time to migrate and blur, but the crystallization process is incomplete and image quality suffers
Solution Approach 1:
The patent changes the crystallization kinetics parameters by introducing a seed layer with specific crystal structure and orientation that matches the ink's crystalline phase. This parameter change accelerates the crystallization rate constant, allowing the ink to complete solidification rapidly within the desired dot boundaries before migration can occur, thereby improving both ease of operation and dot quality
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 can reduce ink crystallization time by up to 30 seconds or more, ensuring quick ink solidification and maintaining superior image quality and substrate integrity, as demonstrated by the use of diurethane compounds and their derivatives.
Implementation Method 1
applying a first crystalline compound on the substrate to form a first layer; and printing an image using an ink comprises a second crystalline compound dispose on the first layer, wherein nucleation sites are formed between the first crystalline compound and the second crystalline compound
Implementation Method 2
The crystallizing seeds significantly speed up the solidification time of the ink by eliminating the delay inherent in the initial crystallization step
Implementation Method 3
the phase change ink is melted by the heater in the printing apparatus and utilized (jetted) as a liquid
Implementation Method 4
Phase change inks for color printing typically comprise a phase change ink carrier composition which is combined with a phase change ink compatible colorant
Data Source
AI summary
The present embodiments relate to methods of increasing ink crystallization. In particular, there is provided a method for increasing the ink crystallization rate comprising providing a substrate; applying a first crystalline compound on the substrate to form a first layer; and printing an image using an ink comprises a second crystalline compound dispose on the first layer, wherein nucleation sites are formed between the first crystalline compound and the second crystalline compound.