Segmented Press Roller for Partial Cold Foil Embossing
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Solution Overview
Problem
Existing devices for transferring imaging layers from a carrier film to printed sheets are inflexible and inefficient, leading to suboptimal use of transfer foil and increased setup times.
Innovation Solution
A device with a press roller featuring a segmented pressing surface that can be tensioned with a rubber blanket, allowing for partial film application and precise control of film feed, enabling targeted transfer of imaging layers and reducing film consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a press roller with a complete pressing surface is used, then the transfer of imaging layers is reliable, but the film consumption increases and flexibility decreases
Solution Approach 1:
The pressing surface of the press roller is divided into multiple independent pressing zones along the circumferential direction. Each pressing zone corresponds to a specific image area and can independently transfer imaging layers. This segmentation allows the film feed to be controlled zone by zone, enabling partial film application only where needed, thus reducing overall film consumption while maintaining reliable transfer in each active zone.
Solution Approach 2:
Different circumferential zones of the press roller are assigned different functions: some zones have pressing surfaces for active film transfer, while other zones have no pressing surface or have reduced pressing capability. This local differentiation ensures that film is transferred only in the areas where imaging layers are required, avoiding waste in non-image areas and improving overall film utilization efficiency.
2Device complexity
If a press roller with a complete pressing surface is used, then the transfer process is simple, but the setup time increases and adaptability decreases
Solution Approach 1:
The pressing surface is segmented into multiple independently controllable zones, allowing selective activation of only the zones needed for the current printing task. This reduces the effective pressing area that needs to be configured and prepared, thereby decreasing setup time while maintaining the simplicity of the overall transfer mechanism.
Solution Approach 2:
The press roller is designed with dynamically adjustable pressing zones, where the pressing surface can be selectively engaged or disengaged along the circumferential direction. This dynamic configuration allows rapid adaptation to different printing requirements without requiring complete reconfiguration of the entire pressing surface, thus reducing setup time and improving adaptability.
3Device complexity
If the film feed is controlled continuously, then the transfer process is simple, but the film utilization efficiency decreases
Solution Approach 1:
The continuous film feed is divided into segments corresponding to different pressing zones. Each zone can independently control its film feed, allowing film to be supplied continuously to the press roller while only specific zones actively transfer imaging layers. This segmented control prevents film waste in inactive zones while maintaining continuous operation, thereby improving film utilization efficiency without significantly complicating the control system.
Solution Approach 2:
The film feed to the press roller is maintained continuously, but the useful transfer action is concentrated in specific active zones. This allows the film to be continuously supplied and positioned, while the pressing mechanism selectively activates transfer only where imaging layers are needed, maximizing the utility of continuous film supply and improving overall productivity.
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 allows for flexible and efficient transfer of imaging layers, reducing setup times and improving film utilization by enabling partial film application and precise control over the transfer process, resulting in significant savings in film consumption and enhanced application precision.
Implementation Method 1
a press roller (3) with a pressing surface (10) that occupies a partial surface of a total surface of a printed sheet (2). Advantageously, such pressing surfaces (10) are designed as segments that can be tensioned underneath a rubber blanket for the rubber blanket provided over the entire area of the press roller (3)
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The film feed in a coating module for transferring imaging layers from a transfer film onto a printing material is to have its applicability extended. To this end, a limited pressing surface is arranged in the coating module for transferring layers from the transfer film (5). Targeted control of the film advancing is therefore possible. Here, the transfer film is preferably guided in a limited width and approximately tangentially past a press roll (3). In order to limit pressing surfaces, format supports (30, 31, 32) for the press fabric (10) are provided.