Digitally Addressable Laser Lamination for High-Speed Foil Transfer
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Solution Overview
Problem
Existing methods for transferring metallic foils to substrates at high speeds face challenges due to insufficient pressure and uneven laser energy distribution, resulting in low-quality transfers.
Innovation Solution
A system that applies pressure to the ribbon using a pressure roll and utilizes a digitally addressable laser to concentrate energy at the interface between the ribbon and substrate, ensuring high-quality transfers by heating the marking material effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a scanning laser is used to heat the marking material, then the marking material can be transferred to the substrate, but the laser energy is not concentrated sufficiently resulting in low quality transfers
Solution Approach 1:
The laser beam is segmented into multiple independent addressable elements (pixels) that can be individually controlled. This allows selective concentration of laser energy at specific locations on the ribbon, enabling high-quality transfers by directing energy precisely where needed rather than using a continuous scanning approach.
Solution Approach 2:
The system transitions from a one-dimensional scanning laser approach to a two-dimensional array of addressable laser elements. This dimensional change allows simultaneous energy delivery across the entire width of the ribbon, concentrating energy effectively at each pixel location without mechanical scanning.
2Manufacturing precision
If pressure is applied to the ribbon between contact rollers, then the ribbon is held against the acceptor element, but the pressure is not sufficient to result in high quality transfers at high speed
Solution Approach 1:
Pressure is applied locally at the transfer zone between the ribbon and substrate using a pressure roller, rather than distributing pressure uniformly along the entire ribbon path. This localized pressure application ensures sufficient contact force at the critical transfer interface to achieve high-quality transfers at high speeds.
3Productivity
If high speed transfer is attempted with existing methods, then productivity increases, but transfer quality deteriorates due to insufficient pressure and uneven laser energy distribution
Solution Approach 1:
The system uses dynamically addressable laser elements that can be rapidly activated and deactivated in response to the moving ribbon's position and transfer requirements. This dynamic control allows the system to maintain high transfer speed while ensuring each marking location receives the precise energy and pressure needed for high-quality transfer.
Solution Approach 2:
The system incorporates feedback control where the state of each addressable laser element is controlled based on the required transfer pattern and ribbon position. This feedback mechanism ensures that laser energy and pressure are applied at the correct locations and times, maintaining transfer quality even at high speeds.
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
Enables high-speed, high-quality transfers of metallic foils to substrates, suitable for applications like chipless RFID labels and security printing, with improved adhesive strength and efficiency.
Implementation Method 1
scan a laser in the cross process direction to heat the marking material such that the marking material is transferred to the substrate
Implementation Method 2
heating the marking material effectively
Implementation Method 3
applies pressure to the ribbon using a pressure roll
Data Source
AI summary
A system is provided for transferring a marking material from a ribbon to a substrate. The system includes a ribbon take-up device; a ribbon supply source that supplies the ribbon to the ribbon take-up device such that the ribbon is moved in a process direction; a pressure roll located between the ribbon supply source and the ribbon take-up device in the process direction, the pressure roll being configured to apply pressure to the ribbon at a pressure location when the ribbon is positioned between the pressure roll and the substrate; and a laser beam source that directs a laser beam or laser light through the pressure roll and onto the ribbon at the pressure location such that a marking portion of the ribbon is heated by the laser beams and transferred to the substrate.