Sublimation Transfer Paper Ink-Receiving Layer Design
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Solution Overview
Problem
Current transfer papers for sublimation printing face challenges in achieving high-fidelity images due to issues like ink smearing, spreading, and defects such as dusting and back gasing, which affect printing definition and efficiency, especially when using standard or gel-like inks.
Innovation Solution
A transfer paper with a fibrous substrate and an ink-receiving layer comprising a cationic inorganic or organic component, filler, hydrophilic binder, and hydrophobic binder, optimized in specific weight percentages to ensure quick drying and perfect printing definition, reducing dusting and defects during the printing and sublimation transfer processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the transfer paper absorbs the solvent from the ink too fast, then the solvent is quickly removed from the ink, but the ink is pulled with the solvent into the paper causing loss of printing definition
Solution Approach 1:
The patent applies a coating layer with specific local properties (hydrophilic-hydrophobic balance, cationic charge density) on the transfer paper surface to create a zone that controls solvent absorption rate and ink interaction, preventing both too-fast and too-slow absorption while maintaining printing definition
Solution Approach 2:
The patent modifies the chemical and physical parameters of the transfer paper coating (surface charge, hydrophilicity, porosity) to optimize the solvent absorption kinetics, achieving a balanced absorption rate that prevents ink smearing while avoiding ink pull-in
2Quantity of substance
If a relatively large amount of sublimable ink is printed onto the transfer paper to ensure sufficient ink availability, then enough ink is available for sublimation, but printing definition is lost due to ink smearing
Solution Approach 1:
The coating layer acts as an intermediary between the ink and the paper substrate, controlling ink distribution and preventing smearing while allowing sufficient ink to remain available for sublimation transfer to the final article
Solution Approach 2:
The cationic coating layer creates preliminary electrostatic attraction to immobilize the ink on the surface, preventing smearing before the sublimation process occurs, thereby maintaining printing definition while preserving ink availability
3Reliability
If cationic agents are used in small proportions as ink fixing agents, then the ink is immobilized on the surface avoiding bleeding, but there is still potential for improvements in drying speed and definition
Solution Approach 1:
The patent uses a composite coating system combining cationic agents with hydrophilic and hydrophobic components, creating a multi-functional layer that simultaneously provides ink immobilization, controlled solvent absorption, and improved drying speed
Solution Approach 2:
The patent optimizes the concentration and distribution of cationic agents within the coating matrix, adjusting their effective density and accessibility to enhance ink fixing while improving drying kinetics through modified surface properties
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 provides a transfer paper that achieves quick drying of sublimable ink, maintains high printing definition, and minimizes defects like dusting and back gasing, enhancing the efficiency and quality of the sublimation printing process.
Implementation Method 1
the ink-receiving layer comprises: a cationic inorganic component and/or a cationic organic component in an amount of from 10 to 90 dry wt. %
Implementation Method 2
a hydrophilic binder in an amount of from 5 to 50 dry wt. %, and a hydrophobic binder in an amount of from 5 to 50 dry wt. %
Implementation Method 3
Sublimation printing techniques are often used to provide images on such articles by using sublimable inks. Sublimable inks are printed indirectly onto the final article. More particularly, the inks are first printed on a so-called transfer paper and then transferred from the printed transfer paper to the final article using heat and pressure
Data Source
AI summary
The present disclosure relates to a transfer paper for sublimation printing comprising a fibrous substrate and an ink-receiving layer ink-receiving layer, wherein the ink-receiving layer comprises a cationic inorganic component, a cationic organic component or both in an amount of from 10 to 90 wt. %, optionally a filler in an amount of up to 75 wt. %, a hydrophilic binder in an amount of from 5 to 50 wt. %, and a hydrophobic binder in an amount of from 5 to 50 wt. %, based on the total weight of the ink-receiving layer. The disclosure also provides a method for preparing a transfer paper for sublimation printing, its use in a method for preparing a printed transfer paper, the printed transfer paper, its use in a method for decorating an article by sublimation and the decorated article.