Thermal Transfer Medium Undercoat Layer High Speed Printing
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Solution Overview
Problem
Conventional thermal transfer recording media fail to achieve high print density and quality, especially at high temperatures and high humidity, due to abnormal transfer issues during high-speed printing.
Innovation Solution
A thermal transfer recording medium with a heat-resistant lubricating layer on one surface and an undercoat layer and dye layer on the other, where the undercoat layer comprises a copolymer of polyester with a sulfonic acid group, acrylic polymer with a glycidyl or carboxyl group, polyvinylpyrrolidone, and an oxazoline group-containing polymer, and the dye layer uses an acid-modified polyvinyl acetoacetal resin as the binder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional thermal transfer recording medium is used, then basic printing function is achieved, but sufficient print density and image quality are not obtained during high-speed printing
Solution Approach 1:
The undercoat layer uses a composite material system consisting of polyester resin (for adhesion and heat resistance), acrylic resin (for flexibility and transfer promotion), and polyvinyl alcohol (for moisture control and surface properties). This composite formulation enables high print density while maintaining high-speed printing capability by optimizing the interaction between dye, undercoat, and thermal head
Solution Approach 2:
The invention optimizes specific parameter ranges: polyester resin content (30-70 parts), acrylic resin content (70-30 parts), polyvinyl alcohol content (5-20 parts), and undercoat layer thickness (3-10 μm). These parameter changes enable the undercoat layer to promote dye transfer efficiently at high speeds while achieving sufficient print density
2Productivity
If thermal transfer is performed at high temperature and high humidity, then printing speed is improved, but abnormal transfer occurs
Solution Approach 1:
The undercoat layer provides localized functional zones: the polyester resin component provides heat-resistant adhesion stability, the acrylic resin component promotes dye transfer, and the polyvinyl alcohol component controls moisture interaction. This local quality distribution within the undercoat layer prevents abnormal transfer while enabling high-speed printing at elevated temperatures and humidity
Solution Approach 2:
The undercoat layer acts as an intermediary between the dye layer and the thermal head, mediating the transfer process. The composite resin system in the undercoat layer controls dye release kinetics, preventing premature or abnormal transfer while enabling complete transfer at high speeds, thus improving both productivity and transfer stability
3Productivity
If high-speed sublimation transfer is performed, then printing efficiency is improved, but transfer sensitivity is insufficient
Solution Approach 1:
The undercoat layer is pre-formed with an optimized composite resin structure before dye transfer. This preliminary preparation creates a surface that actively promotes dye wettability and transfer, enabling high transfer sensitivity even during high-speed printing where contact time is minimized. The pre-configured resin composition ensures rapid and complete dye transfer
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 configuration enhances transfer sensitivity and prevents abnormal transfer at high temperatures and high humidity without increasing the dye amount, ensuring high-quality prints during high-speed printing.
Implementation Method 1
the undercoat layer includes a copolymer of a polyester having a sulfonic acid group and an acrylic polymer having at least one of a glycidyl group and a carboxyl group, polyvinylpyrrolidone, and an oxazoline group-containing polymer
Implementation Method 2
the ink is sublimated (sublimation transfer method) or melted (melt transfer method) by the heat generated by the thermal head of the printer
Implementation Method 3
the ink is sublimated (sublimation transfer method) or melted (melt transfer method) by the heat generated by the thermal head of the printer
Data Source
Figure 1
AI summary
Provided is a thermal transfer recording medium that is capable of dealing with the requirement for an increase in thermal transfer printing speed, and high density and high quality of a thermally transferred image, capable of preventing the occurrence of abnormal transfer at high temperature and high humidity, and capable of improving transfer sensitivity in printing. A thermal transfer recording medium (1) includes a heat-resistant lubricating layer (40) on one surface of a base material (10), and an undercoat layer (20) and a dye layer (30) in that order on the other surface of the base material (10). The undercoat layer (20) includes a copolymer of a polyester having a sulfonic acid group and an acrylic polymer having at least one of a glycidyl group and a carboxyl group, polyvinylpyrrolidone, and an oxazoline group-containing polymer. A binder resin of the dye layer is an acid-modified polyvinyl acetoacetal resin.