Thermal Transfer Sheet Primer Layer Heat Resistance
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Solution Overview
Problem
Conventional thermal transfer sheets face issues with heat resistance and durability during high-speed printing, leading to problems like sticking, print cockles, and ribbon breakage due to the softening of the primer layer under increased heat energy from faster thermal heads.
Innovation Solution
A thermal transfer sheet is developed with a primer layer composed of a polyvinyl alcohol resin and a crosslinking agent, providing flexibility and heat resistance to prevent breaking and ensure smooth operation during high-speed printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the printing speed is increased, then the productivity is improved, but the heat energy from the thermal head increases causing the primer layer to soften and leading to print defects
Solution Approach 1:
The patent changes the chemical composition parameters of the primer layer by incorporating specific resins (polyester resin, polyurethane resin, acrylic resin) and crosslinking agents. This chemical parameter modification enables the primer layer to maintain its physical properties (viscoelasticity, adhesion) under elevated temperatures generated by high-speed printing, thus resolving the contradiction between printing speed and heat resistance
Solution Approach 2:
The patent creates a composite primer layer by combining multiple resin types (polyester, polyurethane, acrylic) with crosslinking agents. This composite material approach synergistically enhances both the heat resistance and flexibility of the primer layer, allowing it to withstand the increased thermal load from high-speed printing while maintaining structural integrity and preventing print defects
2Reliability
If the heat resistance of the heat-resistant slipping layer is improved, then the reliability is improved, but the primer layer softens due to heat energy causing flow of the slipping layer
Solution Approach 1:
The patent employs a composite primer layer formulation combining polyester resin, polyurethane resin, acrylic resin, and crosslinking agents. This composite structure provides both heat resistance and structural stability, preventing the slipping layer from flowing while maintaining the integrity of the primer layer under thermal stress
Solution Approach 2:
The patent modifies the chemical composition parameters of the primer layer to achieve optimal balance between heat resistance and structural stability. The specific ratios and types of resins and crosslinking agents are adjusted to ensure the primer layer maintains its viscoelastic properties and adhesion strength even when exposed to high temperatures from the thermal head during high-speed printing
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 use of a polyvinyl alcohol resin and crosslinking agent in the primer layer enhances the thermal transfer sheet's heat resistance and flexibility, preventing breaking and ensuring suitability for high-speed printing by maintaining the integrity of the sheet under high heat energy.
Implementation Method 1
a primer layer containing a polyvinyl alcohol resin and a crosslinking agent
Implementation Method 2
heat energy emitted from the thermal head
Data Source
Figure 1~2
AI summary
There is provided a thermal transfer sheet that, by virtue of flexibility and heat resistance imparted by a primer layer constituting the thermal transfer sheet, is less likely to be broken even upon exposure to a high level of thermal energy and is highly suitable for high-speed printing. The thermal transfer sheet has a thermally transferable colorant layer provided on one surface of a base material sheet, and a heat-resistant slipping layer provided on the other surface of the base material sheet through a primer layer. The primer layer contains at least a polyvinyl alcohol resin and a crosslinking agent.