Single Element Transfer Process for Non-Tearable Foil
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Solution Overview
Problem
Existing foil transfer processes struggle to reliably transfer relatively non-tearable or tear-resistant materials and resin structures due to their increased structural strength, making it difficult to find a suitable operating window for a clean and consistent break.
Innovation Solution
A single or dual transfer process involving a pre-patch transfer sheet and die-cut sheet, where a carrier substrate is coated with a separation layer, a micro-optic film material or resin structure, and an adhesive layer, with cuts made to create isolated single elements and a background element, allowing for precise transfer using a die-stamping process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional foil transfer processes are used to transfer relatively non-tearable or tear-resistant materials, then the structural strength of the transferred material is improved, but the ability to achieve a clean and consistent break is worsened
Solution Approach 1:
The transfer foil is divided into discrete, isolated elements rather than a continuous sheet. Each element is separated by cut lines that create distinct, manageable units. This segmentation allows the strong, tear-resistant material to be handled in small portions that can break cleanly at the die edge while maintaining their inherent structural strength.
Solution Approach 2:
The transfer foil is pre-cut into isolated elements before the transfer process. This preliminary cutting action creates pre-defined break points and separates the material into manageable segments that are more likely to break cleanly during transfer, rather than attempting to break a continuous sheet of strong material.
2Manufacturing precision
If the operating window is narrowed to achieve clean breaks, then the manufacturing precision is improved, but the productivity is worsened
Solution Approach 1:
By segmenting the transfer foil into isolated elements, the process creates multiple, discrete transfer events that can occur within a broader operating window. Each small element can be transferred independently, allowing for more flexible process parameters and higher productivity while maintaining clean breaks.
Solution Approach 2:
The pre-cutting of isolated elements creates a configuration where the material is already prepared for easy, clean breaking. This preliminary action expands the effective operating window by ensuring that even at higher speeds and broader temperature/pressure ranges, the material will break cleanly at the predetermined cut lines.
3Manufacturing precision
If isolated single elements are transferred, then the manufacturing precision and resolution are improved, but the device complexity is worsened
Solution Approach 1:
The transfer foil is segmented into isolated elements that are already pre-positioned and pre-cut. This segmentation simplifies the actual transfer process because the elements are ready to be transferred as discrete units, reducing the complexity of alignment and positioning during the transfer operation itself.
Solution Approach 2:
The isolated elements are prepared in advance with their shapes and positions predetermined. This preliminary preparation simplifies the transfer process by eliminating the need for complex real-time alignment and positioning operations, as the elements are already configured for optimal transfer.
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 process enables the rapid and reliable transfer of sharply defined single elements to objects, such as security documents, with improved resolution and aesthetic quality, while increasing the operating window for practical manufacturing and enhancing tamper resistance.
Implementation Method 1
applying an adhesive layer to a surface of the applied film material or resin structure
Implementation Method 2
applying a separation layer (e.g., a waxy or lower adhesion separation layer) to a surface of the carrier substrate
Implementation Method 3
The present invention generally relates to a single or dual transfer process for preparing and transferring relatively non-tearable or tear resistant single elements having sharp definition to objects to be protected
Implementation Method 4
transferring the isolated single elements from the pre-patch transfer sheet to the objects to be protected
Data Source
AI summary
A fast and reliable single or dual transfer process is provided. Unlike prior art foil transfer techniques, which rely on the very fragile nature of the transferred pattern and/or shape to obtain a clean break at the die edge, the present invention is directed toward relatively non-tearable or tear resistant materials that can be difficult or impossible to effectively transfer using these known foil transfer techniques. This problem is addressed by precision cutting, for example, patches in the relatively non-tearable or tear resistant material positioned on a carrier substrate and in one exemplary embodiment transferring areas surrounding the cut patches to a sacrificial carrier substrate. The resulting sharply defined, precision cut patches left on the carrier substrate may then be transferred to objects to be protected such as banknotes.