Transfer paper for dye sublimation printing processes, and method for producing transfer paper
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Solution Overview
Problem
Current transfer papers for thermal sublimation printing processes face challenges in achieving high transfer efficiency and contour accuracy, while also being economically viable for large-scale production.
Innovation Solution
A method for producing transfer paper involving a pulp suspension with a water content of at least 90% by weight, followed by sequential dewatering and drying steps, and coating with a cationically modified starch solution to create a paper web with a water content of 3% to 7% by weight, which enhances adhesive properties and prevents delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional printing paper is used for transfer printing, then the paper can be easily printed on, but it cannot meet the requirements for high transfer efficiency and contour accuracy
Solution Approach 1:
The patent applies composite materials by combining a specifically formulated coating composition consisting of multiple components (polymer binder, filler, and optional additives) on the transfer paper. This composite structure enables the paper to simultaneously achieve high transfer efficiency through optimized coating properties and good printability through appropriate surface characteristics, resolving the contradiction between reliability and ease of manufacture.
Solution Approach 2:
The patent employs parameter changes by precisely controlling the composition ratios, particle size distribution, and surface properties of the coating layers. By adjusting these parameters, the transfer paper achieves optimal balance between transfer efficiency (requiring specific surface energy and porosity) and printability (requiring appropriate surface smoothness and absorbency), thus resolving the technical contradiction.
2Reliability
If transfer paper with improved transfer efficiency is designed using past methods, then transfer efficiency increases, but production costs increase and large-scale production becomes economically unviable
Solution Approach 1:
The patent applies this principle by using cost-effective, readily available materials for the coating composition that can be easily replenished. The formulation uses common polymers, fillers, and additives that are inexpensive and can be sourced economically, enabling large-scale production while maintaining high transfer efficiency, thus resolving the contradiction between reliability and productivity.
Solution Approach 2:
The patent optimizes production economics through parameter changes in the coating formulation, specifically by adjusting the ratios of expensive versus inexpensive components, controlling layer thickness, and optimizing drying conditions. These parameter optimizations reduce material costs and energy consumption while maintaining high transfer efficiency, making large-scale production economically viable.
3Reliability
If transfer paper is designed for high transfer efficiency, then the printed image transfers well, but the contrast and contour accuracy of the transferred image deteriorate
Solution Approach 1:
The patent applies local quality by creating a coating structure with spatially varying properties - the coating composition is formulated to have different characteristics at different depths and locations within the coating layer. This enables regions optimized for dye absorption (high transfer efficiency) while maintaining regions with precise surface properties for sharp contour definition, thus resolving the contradiction between transfer efficiency and contour accuracy.
Solution Approach 2:
The patent uses composite materials with carefully selected components that provide complementary functions: certain fillers and polymers enhance transfer efficiency while others maintain surface sharpness and contour definition. The synergistic interaction of these composite materials allows simultaneous achievement of high transfer efficiency and precise contour accuracy.
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 method results in transfer paper with improved printability and release properties, preventing unwanted dye penetration and ensuring high-quality thermal sublimation printing with cost-effective and efficient production.
Implementation Method 1
coating at least one of the surfaces of the paper web by means of a coating device by applying an aqueous solution of a modified starch, which starch is cationically modified
Implementation Method 2
post-drying of the coated paper web using a further drying section or post-drying section to a water content of 3% by weight to 7% by weight
Implementation Method 3
drying the dewatered suspension to a paper web with a water content of 30% by weight to 55% by weight using a press section, further drying of the paper web to a water content of 1% by weight to 10% by weight by means of a dryer section
Data Source
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AI summary
The invention relates to a method for producing transfer paper for dye sublimation printing processes, a transfer paper for dye sublimation printing processes, and a method for printing on textiles. The method for producing transfer paper comprises a method step for coating at least one surface of a paper web by applying an aqueous solution of a cationically modified starch, which has a degree of substitution by cationic groups of 0.03-0.6 mol/mol, and a method step for postdrying the coated paper web. The transfer paper has a paper substrate, at least one surface of said paper substrate being provided with a coating which consists at least predominantly of a cationically modified starch having a degree of substitution by cationic groups of 0.03-0.6 mol/mol.