Variable Thickness Transfer Cylinder for Foil Stamping
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Solution Overview
Problem
Existing devices for transferring imaging layers from a carrier film to printed sheets are inflexible and result in high consumption of transfer film, making them costly and inefficient.
Innovation Solution
A device that uses a transfer cylinder with increased additional pressure and a raised pressing surface, equipped with a compressible press covering, to guide the transfer film tangentially through the transfer gap, allowing precise control over the film feed and tension, ensuring efficient transfer of the imaging layer onto the printed sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional film transfer module with tangential film guidance is used, then the transfer process is simple, but the device is inflexible and transfer film consumption is high
Solution Approach 1:
The patent implements dynamic control of the transfer film feed through a programmable feed control device that can adjust the film feed rate independently from the substrate transport speed. This allows the system to adapt to different coating requirements and substrate types, enabling flexible operation while minimizing film consumption by precisely controlling when and how much film is transferred.
Solution Approach 2:
The invention changes the operational parameters by introducing independent control of film feed speed versus substrate transport speed, and by implementing variable pressure control through the press roller. These parameter changes enable optimized film transfer that reduces waste while maintaining flexibility for different application requirements.
2Productivity
If increased additional pressure is applied during film transfer, then the imaging layer transfers more efficiently, but the stress on the carrier film increases
Solution Approach 1:
The patent applies pressure locally and selectively through a press roller that contacts only the transfer film and substrate in the transfer zone. This localized pressure application ensures efficient imaging layer transfer at the press nip while avoiding excessive stress on the carrier film in other areas, as the pressure is concentrated only where needed for transfer.
Solution Approach 2:
The invention optimizes the pressure parameter by using a programmable feed control system that coordinates pressure application with film feed rate and substrate speed. This allows efficient transfer through controlled pressure while managing the stress on the carrier film through synchronized parameter adjustment.
3Manufacturing precision
If the transfer film is guided tangentially through the transfer gap, then the film feed can be controlled precisely, but the device complexity increases
Solution Approach 1:
The patent achieves precise film feed control by integrating the feed control function into the existing roller system, where the press roller and drive rollers serve multiple functions: guiding the film, applying pressure, and controlling feed rate. This multi-functional approach provides precise control without requiring a completely separate complex guidance system.
Solution Approach 2:
The invention utilizes the transition zone where the transfer film passes from the carrier film to the substrate as a control point. The programmable feed control system manages the film's state changes during transfer, achieving precise control through coordinated motion control rather than complex mechanical guidance structures.
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 solution enables flexible and cost-effective transfer of imaging layers by minimizing film consumption and ensuring a clean, crack-free application, with improved adhesion and reduced stress on the carrier film, thus enhancing the overall coating process.
Implementation Method 1
the transfer film is processed during the film transfer by means of the transfer cylinder with an increased additional pressure
Implementation Method 2
a raised pressing surface, equipped with a compressible press covering, to guide the transfer film tangentially through the transfer gap
Data Source
Figure 1
Figure 2~3
AI summary
To transfer a coating in image form from a transfer foil to a print sheet, adhesive is applied in the form of the image to said sheet. In a foil transfer module (2), the carrier foil with the coating in image form is then brought into contact with the print sheet using contact pressure, so that the coating adheres to the adhesive points and an image is produced. To improve the function, simplify the device and increase the flexibility of the method, a transfer cylinder (3) is provided with a covering that has a variable cover thickness (25), in order to adapt the surface speed of the transfer cylinder (3).