Stationary Hot-Stamping Head with Movable Roller for 3D Foil Application
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Solution Overview
Problem
Existing hot stamping processes are limited by the inability to apply covering materials uniformly on non-flat surfaces due to issues with foil tension and pressure control, leading to coating traces and unsuitable yield rates, especially when dealing with complex shapes or large parts.
Innovation Solution
An application head with a movable roller element, tensioning elements, and balancing elements, actuated by a servo-controlled motor, which maintains a predefined tension and pressure level, allowing for precise application of covering materials on 3D objects using a robotic arm with six degrees of freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a linear hot stamping head moves along a part to apply covering material, then the application process can be performed on flat plastic parts, but the system cannot apply material on rounded edges or complex shapes and requires multiple heads for different sides
Solution Approach 1:
The application head is made movable with respect to the base unit through an actuator mechanism, allowing the head to dynamically adjust its position and orientation. This enables a single head to service multiple sides and complex geometries of plastic parts, replacing the need for multiple fixed linear heads.
Solution Approach 2:
The movable application head is designed to perform hot stamping operations on various part geometries including flat surfaces, rounded edges, and complex three-dimensional shapes. This universal capability allows one head to replace multiple specialized heads, reducing system complexity while expanding applicability.
2Area of stationary object
If the hot stamping head moves during operation, then coverage can be achieved on larger areas, but heat control and foil balance are affected due to air movement
Solution Approach 1:
The system employs a movable application head that can dynamically position itself to cover large areas while maintaining process stability. The head's movement is controlled to minimize air disturbances, and the base unit remains stationary to provide a stable reference frame for heating and foil application.
Solution Approach 2:
The actuator mechanism serves as an intermediary between the stationary base unit and the movable application head. It enables precise positioning while isolating the heating and foil application processes from excessive air movement, maintaining thermal and material stability during operation.
3Ease of operation
If foil tension is not properly controlled during vertical movement, then the application process is simpler, but coating traces appear and yield rate decreases
Solution Approach 1:
The system incorporates foil tension control through a feedback mechanism that monitors and adjusts tension during the hot stamping process. This ensures optimal foil tension is maintained regardless of vertical movement, preventing coating traces and maintaining high yield rates while keeping the operation straightforward.
Solution Approach 2:
The application head includes integrated foil tensioning and guiding elements that automatically maintain proper foil tension during movement. The system self-regulates to prevent coating defects without requiring complex external intervention, maintaining both simplicity and precision.
4Manufacturing precision
If the system is designed for specific part dimensions, then the application precision is optimized, but the system size must be scaled with part size and flexibility is reduced
Solution Approach 1:
The application head is designed with movable components that can dynamically adjust their position and configuration to accommodate different part dimensions. This allows the system to maintain optimal application precision across various part sizes without requiring fixed, size-specific configurations.
Solution Approach 2:
The system employs a universal application head design that can service multiple part sizes and geometries through programmable movement paths and adjustable positioning. This eliminates the need for multiple dedicated systems for different part dimensions, providing both precision and flexibility.
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-precision, flexible, and cost-effective application of covering materials on various parts without design changes, reducing the likelihood of material breakage and coating traces, and allowing for efficient processing of complex shapes.
Implementation Method 1
hot stamping is a process, according to which a heat transferable foil with cosmetic appearance is applied with a hot roller silicon cylinder
Implementation Method 2
pressure of hot silicon
Implementation Method 3
at least one tensioning element (6) for tensioning the covering material (13)
Implementation Method 4
at least one balancing element (5) for pressure adjustment between application head, in particular moveable element and/or tensioning element and/or the roller element (8), and the object (2)
Data Source
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AI summary
The present invention refers to an application head (4) for the application of a covering material (13) onto an object (2). Said application head (4) comprises at least a base unit (14) and a movable unit (15), wherein the movable unit (15) is movable with respect to base unit (15), a roller element (8) for applying said covering material (13) onto the object (2), wherein the roller element (8) is movable by an actuator means (12), at least one tensioning element (6) for tensioning the covering material (13), wherein the tensioning element (6) is attached to the movable unit (15) and deflectable with respect to the movable unit (15), at least one balancing element (5) for pressure adjustment between the roller element (8) and the object (2), wherein said balancing element (5) is coupled with the movable unit (15) and the base unit (14).