Foil Application on Securities Sheets Using Continuous Band Cutting
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Solution Overview
Problem
Existing methods for applying foil material onto security documents are complex, require precise cutting and positioning of strips, and are not suitable for small-sized patches or wide range of sizes, affecting downstream processing.
Innovation Solution
A method involving the application of a continuous band of foil material onto sheets, which is then cut at specific positions to ensure precise application and alignment, using mechanical, heating, or laser cutting techniques, allowing for various sizes and minimizing disruption in downstream processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If precise cutting and positioning of foil strips is used, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The foil material itself serves as the positioning reference through its continuous band structure. The cutting unit simply cuts the continuous band at regular intervals, and the foil's inherent continuity ensures proper alignment without requiring complex external positioning systems. The adhesive layer on the foil also self-aligns during application.
Solution Approach 2:
The invention extracts the positioning function from a separate complex positioning system and embeds it directly into the foil material structure. The continuous band format with integrated adhesive layer contains all necessary alignment information within the foil itself, eliminating the need for separate positioning mechanisms.
2Productivity
If continuous band of foil material is applied, then productivity is improved, but manufacturing precision worsens
Solution Approach 1:
The continuous band structure with embedded adhesive layer serves itself for positioning during high-speed application. The adhesive activates under heat and pressure to bond the foil to the substrate, while the continuous nature of the band ensures uninterrupted coverage and automatic alignment during the printing process.
Solution Approach 2:
The adhesive layer is pre-applied to the foil material before the printing process. This preliminary preparation allows the foil to be positioned and bonded correctly during the high-speed printing operation without requiring additional positioning steps that would reduce productivity.
3Stability of the object's composition
If cutting is performed at sheet edges, then sheet integrity is improved, but manufacturing precision worsens
Solution Approach 1:
The cutting operation is localized to specific regions at the sheet edges rather than affecting the entire sheet. The foil material is cut only in the marginal areas where it extends beyond the sheet boundaries, leaving the central region with precise foil positioning undisturbed and maintaining overall sheet integrity.
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
Ensures precise and efficient application of foil material without perturbing further processing, enabling the use of a wide range of foil sizes and materials, including small patches, while maintaining sheet integrity.
Implementation Method 1
hot-foil stamping techniques, which make use of combined pressure and temperature to activate an adhesive layer provided on the transfer elements and cause transfer thereof from the carrier material onto the sheets
Implementation Method 2
hot-foil stamping techniques, which make use of combined pressure and temperature
Implementation Method 3
A method and installation for cutting windows in sheets using a laser-cutting tool
Implementation Method 4
A method and installation for cutting windows in sheets using mechanical cutting tools
Data Source
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AI summary
There is described a method for applying foil material (200) onto successive sheets (S), especially sheets of securities. In a first step, individual sheets (S) are transported in succession along a sheet transport path. In a second step, at least one continuous band of foil material (200) is applied onto the individual sheets (S) along a direction substantially parallel to a direction of displacement of the individual sheets, thereby forming a continuous flow of sheets linked to one another by the said at least one continuous band of foil material (200). In a third step, the said at least one continuous band of foil material (200) is cut such that the continuous flow of sheets is again separated into individual sheets (S) with portions of foil material (200*) remaining on the sheet. The cutting is performed at positions located on the sheets (S) such that said portions of foil material (200*) remaining on the sheets do not extend beyond leading and trailing edges of the sheets (S). There is also described an installation for carrying out the above method.