Transfer paper for sublimation printing, comprising a cationic agent
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Solution Overview
Problem
Transfer papers for sublimation printing with hydrophilic polymer-based barrier layers suffer from long drying times, limited printing speeds, and impaired print quality due to color mixing and feathering, while attempts to alleviate these issues increase formulation costs and reduce transfer rates.
Innovation Solution
A transfer paper with a fibrous substrate treated on at least one face with cationic agents, where the cationic agents constitute greater than or equal to 8% of the dry weight, enhancing ink fixation and reducing the need for mineral loads and other formulation ingredients, resulting in improved printability and optical density with faster ink drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydrophilic polymer-based barrier layer is used, then ink fixation is improved, but drying time increases and printing speed decreases
Solution Approach 1:
The patent changes the chemical composition parameters of the barrier layer by incorporating cationic agents (quaternary ammonium compounds) at specific concentrations (0.1-5% w/w) alongside hydrophilic polymers. This parameter modification allows the layer to maintain ink fixation capabilities while reducing drying time through enhanced water repellency and faster evaporation characteristics.
Solution Approach 2:
The invention creates a composite barrier layer material combining hydrophilic polymers (carboxymethyl cellulose, starch, or polyvinyl alcohol) with cationic agents (quaternary ammonium compounds). This composite structure leverages the ink-binding properties of hydrophilic polymers and the water-repellent, fast-drying characteristics of cationic agents, achieving both good ink fixation and rapid drying.
2Manufacturing precision
If mineral loads are added to the barrier layer, then print quality is improved, but formulation cost increases and transfer rate decreases
Solution Approach 1:
The patent extracts or removes the mineral load component (such as calcium carbonate or kaolin) from the barrier layer formulation. Instead of relying on mineral loads for print quality, the invention achieves equivalent or superior results through the optimized combination of hydrophilic polymers and cationic agents, thereby eliminating the associated formulation costs and transfer rate limitations.
Solution Approach 2:
The invention changes the formulation parameters by adjusting the concentrations and types of polymers and cationic agents to achieve the desired print quality without mineral loads. Specifically, the cationic agents provide enhanced ink fixation and surface properties that compensate for the absence of mineral fillers, maintaining print quality while reducing costs.
3Productivity
If the barrier layer is optimized for fast drying, then printing speed is improved, but ink fixation deteriorates
Solution Approach 1:
The patent employs a composite material system where hydrophilic polymers provide strong ink binding and fixation, while cationic agents (quaternary ammonium compounds) contribute fast-drying properties through their water-repellent characteristics. The synergistic interaction between these components ensures that rapid evaporation does not compromise ink fixation, as the cationic agents work together with the polymer matrix to retain ink while accelerating water removal.
Solution Approach 2:
The invention optimizes the concentration ratios of hydrophilic polymers to cationic agents within specific ranges (0.1-5% w/w for cationic agents) to balance drying speed and ink fixation. By carefully controlling these compositional parameters, the barrier layer achieves both fast drying for high printing speed and sufficient ink retention for reliable fixation.
4Reliability
If cationic agents are used in high concentration, then ink immobilization is improved, but the presence of other formulation ingredients must be minimized
Solution Approach 1:
The patent removes or minimizes the presence of dispersants, wetting agents, thickeners, and other auxiliary formulation ingredients that would interfere with the high-concentration cationic agent system. By simplifying the formulation to primarily hydrophilic polymers and cationic agents, the invention ensures that the cationic agents can effectively immobilize ink without competition from other additives, thereby improving ink fixation while reducing formulation 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 high concentration of cationic agents ensures effective ink immobilization on the surface, reducing feathering and improving optical density, while minimizing the presence of other formulation agents to optimize ink fixation and drying speed, thereby enhancing print quality and transfer efficiency.
Implementation Method 1
The high concentration of cationic agents ensures effective ink immobilization on the surface, reducing feathering and improving optical density
Implementation Method 2
Sublimation printing makes it possible to provide an image on a support, such as a metal, glass, plastic or fabric surface, using sublimable inks
Data Source
AI summary
The invention relates to transfer paper for sublimation printing, comprising a fibrous substrate, said transfer paper having one or more cationic agents on at least one face thereof, deposited on the fibrous substrate by means of surface treatment, the amount of cationic agent(s) being greater than or equal to 8% by dry weight of the total dry weight of the compound(s) added to the fibrous substrate by means of the surface treatment.