Thermal Transfer Sheet Primer Layer Adhesion Control
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Solution Overview
Problem
Conventional thermal transfer sheets with primer layers composed of polyvinyl acetal resin and chelate agents tend to cause manufacturing defects due to heat-resistant slipping layer adhesion to guide rollers and are prone to printing failures like wrinkles during high-speed printing.
Innovation Solution
A thermal transfer sheet design featuring a primer layer with a cured product of resin composition containing urethane or polyester resin and compounds with epoxy, silanol, or hydrolyzable silyl groups, enhancing adhesion and preventing slipping layer transfer to guide rollers and reducing printing wrinkles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a primer layer composed of polyvinyl acetal resin and chelate agent is used, then the heat resistant slipping layer can be formed on the substrate sheet, but the heat resistant slipping layer attaches and transfers to the guide roller during conveyance
Solution Approach 1:
The patent changes the chemical composition parameters of the primer layer by replacing polyvinyl acetal resin with polyvinyl butyral resin and adjusting the chelate agent composition. This parameter change modifies the adhesive properties of the primer layer, preventing the heat resistant slipping layer from transferring to the guide roller while maintaining heat resistance.
Solution Approach 2:
The patent uses a composite primer layer composition combining polyvinyl butyral resin with specific chelate agents (titanium chelate or zirconium chelate). This composite material approach creates optimal adhesion characteristics that prevent slipping layer transfer during high-speed conveyance while maintaining heat resistance.
2Productivity
If the thermal transfer sheet is conveyed at high speed, then productivity increases, but the heat resistant slipping layer attaches to the guide roller and printing wrinkles occur
Solution Approach 1:
The patent modifies the primer layer composition parameters to achieve optimal balance between adhesion and release properties. By using polyvinyl butyral resin with specific chelate agents, the primer layer provides sufficient adhesion during high-speed conveyance to prevent slipping layer transfer, while allowing proper release during the printing process, thus eliminating wrinkles.
3Productivity
If the thermal energy from the thermal head increases, then printing speed improves, but fusion sticking between the thermal head and heat resistant slipping layer occurs
Solution Approach 1:
The primer layer acts as an intermediary between the substrate sheet and the heat resistant slipping layer. By using polyvinyl butyral resin with chelate agents, this intermediary layer provides controlled adhesion that prevents fusion sticking between the thermal head and slipping layer during high-energy printing, while maintaining proper bonding during conveyance.
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 effectively prevents heat-resistant slipping layer transfer and minimizes printing wrinkles, ensuring reliable and high-quality thermal transfer printing.
Implementation Method 1
a primer layer, wherein the primer layer contains a cured product of a resin composition containing one or more kinds of resins selected from a urethane resin and a polyester resin and a compound having a functional group selected from an epoxy group, a silanol group and a hydrolyzable silyl group
Implementation Method 2
the primer layer contains a cured product of a resin composition containing one or more kinds of resins selected from a urethane resin and a polyester resin and a compound having a functional group selected from an epoxy group, a silanol group and a hydrolyzable silyl group
Data Source
Figure 1~3
AI summary
The present invention is to provide a thermal transfer sheet which is able to prevent a heat resistant slipping layer from transferring to a guide roller, etc., and which is able to prevent wrinkles when printing. Disclosed is a thermal transfer sheet including a substrate sheet, a thermal transfer layer disposed on one side of the substrate sheet, and a heat resistant slipping layer disposed on the other side of the substrate sheet via a primer layer, wherein the primer layer contains a cured product of a resin composition containing one or more kinds of resins selected from a urethane resin and a polyester resin and a compound having a functional group selected from an epoxy group, a silanol group and a hydrolyzable silyl group.