Dye-Donor Element Wax Slipping Layer Reduces Retransfer
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Solution Overview
Problem
High-speed thermal dye transfer processes face challenges with dye retransfer issues, leading to quality problems such as unwanted dye contamination in white areas of prints due to dye migration during storage and shipping, which existing solutions have not adequately addressed.
Innovation Solution
A dye-donor element with a slipping layer comprising a combination of three waxes: a polymer derived from polyolefin and ethylenically unsaturated carboxylic acid, a highly branched α-olefin polymer, and another wax, which reduces dye retransfer and prevents contamination by enhancing lubrication and friction properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a higher dye/binder ratio is used to achieve high-speed printing, then printing speed and productivity are improved, but dye transfer to the slip layer occurs during storage and shipping, causing quality problems
Solution Approach 1:
The patent introduces a dye-repellent layer as an intermediary between the slip layer and the dye donor layer. This layer acts as a barrier that prevents dye from transferring to the slip layer during storage and shipping, while allowing the high dye/binder ratio to be maintained for high-speed printing. The dye-repellent layer mediates between the conflicting requirements of productivity and reliability.
Solution Approach 2:
The patent creates a composite structure consisting of multiple layers: the slip layer, the dye-repellent layer (comprising a barrier layer and an intermediate layer), and the dye donor layer. This composite material structure combines the lubrication properties of the slip layer with the dye-blocking properties of the dye-repellent layer, resolving the contradiction between maintaining high dye concentration for speed and preventing dye transfer for quality.
2Ease of operation
If the slip layer is made smoother to reduce friction, then ease of operation is improved, but dye transfer to the slip layer increases, worsening print quality
Solution Approach 1:
The patent segments the slip layer functionality into two separate layers: the slip layer itself (providing low friction and smooth operation) and the dye-repellent layer (providing dye transfer prevention). This segmentation allows each layer to be optimized for its specific function without compromising the other, resolving the contradiction between ease of operation and print quality.
Solution Approach 2:
The dye-repellent layer serves as an intermediary barrier between the smooth slip layer and the dye donor layer. It prevents dye from reaching the slip layer while allowing the slip layer to maintain its smooth, low-friction properties for ease of operation.
3Device complexity
If a single-layer protective laminate is used, then device complexity is reduced, but dye retransfer from the slip layer to the laminate occurs, affecting print quality
Solution Approach 1:
The patent replaces the single-layer protective laminate with a composite dye-repellent layer consisting of a barrier layer and an intermediate layer. This composite structure provides effective dye blocking while maintaining reasonable complexity. The barrier layer specifically prevents dye transfer to the laminate, while the intermediate layer provides additional functional properties.
Solution Approach 2:
The dye-repellent layer introduces local quality differentiation with its two-sublayer structure. The barrier layer has specific properties for dye rejection, while the intermediate layer has properties for adhesion and flexibility. This local differentiation allows the laminate structure to address dye retransfer issues without excessive overall complexity.
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 effectively minimizes dye retransfer, preventing unwanted dye contamination on the laminate and protective layers, resulting in improved print quality and stability, especially in high-speed printing operations.
Implementation Method 1
the slipping layer comprises at least three different waxes: a first wax comprising a polymer derived from a polyolefm and an ethylenically unsaturated carboxylic acid or ester or anhydride thereof, a second wax that is a highly branched α-olefin polymer and at least one other wax
Data Source
AI summary
The present invention relates to a dye-donor element for thermal dye transfer comprising a support having on one side a dye layer and on a second side a slipping layer, wherein the slipping layer comprises at least three different waxes: a first wax comprising a polymer derived from a polyolefin and an ethylenically unsaturated carboxylic acid or ester or anhydride thereof, a second wax that is a highly branched α-olefin polymer, and at least one other wax wherein the dye layer comprises at least a yellow dye of one of structures X, XI, XII or XIII wherein the dye donor element has reduced 2X retransfer.