Thermal Transfer Printing Peeling Angle Control
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Solution Overview
Problem
In thermal transfer printing, the adhesion between the substrate and the release layer decreases when the thermal transfer ribbon is subjected to heat and pressure, leading to the transfer layer separating from the substrate and forming marginal parts on the transfer target medium, which can detach and hinder processing.
Innovation Solution
A printing apparatus with a head mechanism, ribbon conveyance unit, and medium conveyance unit is configured to maintain a peeling angle of 30° or less between the thermal transfer ribbon and the transfer target medium, enhancing the adhesive force between the substrate and the release layer and suppressing the formation of marginal parts by controlling the direction of conveyance and temperature at the peeling position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If heat and pressure are applied to the transfer target region, then the transfer layer is transferred to the transfer target medium, but the adhesion between the substrate and the release layer decreases in the surrounding region, causing marginal parts to form
Solution Approach 1:
The patent applies different conditions to different regions of the thermal transfer ribbon. The transfer target region receives both heat and pressure to enable transfer, while the surrounding region receives only heat without pressure. This localized differentiation prevents the release layer from separating in non-transfer areas, eliminating marginal part formation while maintaining transfer accuracy in the target region.
Solution Approach 2:
The patent segments the pressure application area to coincide precisely with the transfer target region. By controlling the pressure application boundaries, the system ensures that only the intended transfer area experiences pressure, while surrounding areas remain under heat-only conditions. This segmentation prevents unwanted separation and marginal part formation at the boundaries of the transfer region.
2Reliability
If the optical functional layer with diffraction structure is included in the transfer layer, then anti-counterfeiting and decorativeness are enhanced, but the transfer layer in the surrounding region is more likely to separate from the substrate
Solution Approach 1:
The patent maintains uniform local quality conditions across the entire thermal transfer ribbon width. By applying heat uniformly across both the transfer target region and surrounding region while applying pressure only to the transfer target region, the system prevents differential expansion and adhesion instability that would otherwise be caused by the hard optical functional layer's response to thermal gradients.
3Productivity
If the thermal transfer ribbon is heated to enable transfer, then the transfer layer transfers to the medium, but heat transfers to the surrounding region causing adhesion decrease
Solution Approach 1:
The patent extracts the pressure application from the surrounding region while maintaining heat application. By removing only the pressure component from non-transfer areas, the system allows heat to continue warming the entire ribbon for efficient transfer initiation, while preventing the heat-induced adhesion loss from causing marginal part formation in surrounding areas.
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 effectively suppresses the formation of marginal parts during the transfer process, ensuring a smoother and more accurate transfer of the transfer layer from the thermal transfer ribbon to the transfer target medium.
Implementation Method 1
the transfer position being a position where the thermal transfer ribbon overlaid on the transfer target medium is subjected to heat and pressure from the thermal head
Implementation Method 2
a ribbon conveyance unit that defines a conveyance path of the thermal transfer ribbon and conveys the thermal transfer ribbon along the conveyance path of the thermal transfer ribbon
Data Source
AI summary
A printing apparatus includes a head mechanism including a thermal head; a ribbon conveyance unit that defines a conveyance path of a thermal transfer ribbon and conveys the thermal transfer ribbon along the conveyance path of the thermal transfer ribbon; and a medium conveyance unit that defines a conveyance path of a transfer target medium and conveys the transfer target medium along the conveyance path of the transfer target medium. Each of the conveyance path of the thermal transfer ribbon and the conveyance path of the transfer target medium includes a transfer position and a peeling position downstream of the transfer position, the transfer position being a position where the thermal transfer ribbon overlaid on the transfer target medium is subjected to heat and pressure from the thermal head, the peeling position being a position where the thermal transfer ribbon starts to be peeled away from the transfer target medium.