Cold-Foil Stamping Controllable Conveyor Film Feed
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Solution Overview
Problem
Existing devices for transferring imaging layers from a carrier film to printed sheets lack flexibility and adaptability when switching between different printing materials, resulting in inconsistent print quality.
Innovation Solution
A device with controllable conveyor systems that allow for the precise control of film feed, including stopping and starting the film transport, and adjusting drive parameters based on production and quality data to optimize web tension and film transfer, utilizing segmented pressing surfaces and dancer rollers to manage film tension and consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If continuous film feed is used in existing coating modules, then the printing process can proceed without interruption, but the film cannot be precisely controlled when switching between different printing materials, resulting in inconsistent print quality
Solution Approach 1:
The film feed system is transformed from a continuous static process to a dynamic controllable process. The patent introduces controllable conveyor devices that can dynamically adjust film transport based on production data and quality requirements, enabling precise control when switching between different printing materials while maintaining adaptability.
Solution Approach 2:
The patent implements control of conveyor devices based on parameter changes in production data and quality data. By adjusting drive parameters of the conveyor devices according to different printing materials and quality requirements, the system achieves both adaptability to material changes and consistency in print quality.
2Productivity
If the film is continuously transported through the coating module, then productivity is maintained, but web tension cannot be optimized for different materials, leading to film waste and quality issues
Solution Approach 1:
The patent implements periodic control of film transport by the controllable conveyor devices. Instead of continuous uninterrupted feed, the system periodically adjusts film transport based on production cycles and quality requirements, allowing optimization of web tension for each printing material while maintaining overall productivity through controlled intermittent operation.
3Adaptability or versatility
If standard conveyor devices are used without control mechanisms, then device complexity is low, but flexibility and adaptability when switching printing materials are severely limited
Solution Approach 1:
The controllable conveyor devices serve multiple functions: they transport film continuously for productivity, adjust web tension for different materials for adaptability, and control film feed precision for quality consistency. This multi-functionality achieves high adaptability without proportionally increasing device complexity, as the same devices perform multiple controlled operations.
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 flexible and adaptable film transfer, improving print quality across various printing materials by optimizing web tension and film utilization, reducing waste and maintaining consistent coating quality.
Implementation Method 1
a press roller (3) and an impression cylinder (4) interacting with one another are provided in the coating module for forming a transfer gap (6)
Implementation Method 2
an adhesive pattern is applied using the planographic printing process... The metallic layer lying underneath forms a close bond with the areas on the printed sheet provided with adhesive
Implementation Method 3
a dancer roller (18) for regulating web tension of the transfer film (5)
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The aim of the invention is to diversify foil feed in a coating station for transferring imaging layers from a transfer foil onto a printing material. For this purpose, a delimited pressing surface is arranged in the coating station for transferring layers from the transfer foil 5. This allows a targeted control of foil feed. The transfer foil 5 is guided past a press roll 3 preferably with a limited foil width and approximately tangentially. To delimit pressing surfaces, format supports 30, 31, 32 are provided for the press roll cover 10. The drives for moving the foil web 5 are controlled during timing depending on the respective thickness of the printing material.