Laser Transfer Foil Marking on Non-Flat Surfaces
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Solution Overview
Problem
Existing methods for laser-induced pigment transfer to non-flat surfaces are inefficient due to geometrical tolerances and the inability to maintain intimate contact between the laser transfer foil and the article surface, leading to suboptimal marking results.
Innovation Solution
A method and device utilizing a hard adaptor with a contacting surface that is a negative of the article's marking surface, combined with an optional soft material layer, to ensure intimate contact and precise alignment, allowing for effective laser-induced marking by irradiating the laser light through the adaptor onto the transfer foil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vacuum is applied to bring the laser transfer foil into contact with the article surface, then contact is achieved, but the method is complex and requires additional equipment
Solution Approach 1:
A hard adaptor serves as an intermediary element between the laser transfer foil and the article surface. The adaptor has a contacting surface that is essentially a negative of the marking surface, allowing the foil to be pressed into intimate contact with the article surface through mechanical pressure rather than vacuum suction, thereby simplifying the overall system
Solution Approach 2:
The patent replaces the vacuum mechanical system with a simpler mechanical pressing system. Instead of using vacuum suction forces to bring the foil into contact with the surface, a hard adaptor mechanically presses the foil against the article surface, eliminating the need for complex vacuum equipment
2Manufacturing precision
If laser transfer foil is applied to non-flat surfaces, then marking is achieved, but geometrical tolerances prevent intimate contact between foil and surface
Solution Approach 1:
The hard adaptor is created as a precise negative copy or inverse mold of the marking surface geometry. This copying approach allows the adaptor to perfectly compensate for the non-flat surface geometry and geometrical tolerances, ensuring that the laser transfer foil is pressed into intimate contact with the entire marking surface regardless of surface variations
Solution Approach 2:
The patent changes the geometric parameters of the contacting surface to match the negative of the marking surface. By inverting the geometry parameters, the hard adaptor creates a complementary shape that accommodates surface variations and ensures uniform contact pressure across the entire marking area
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 approach enables accurate and efficient marking of non-flat surfaces by balancing geometrical tolerances and maintaining contact, resulting in improved marking quality and consistency across articles with varying dimensions.
Implementation Method 1
a first laser unit for emitting and in particular scanning first laser light over a first transfer area
Implementation Method 2
irradiating the first laser light through the first hard adaptor onto the first laser transfer foil
Data Source
AI summary
A device for laser-induced marking of an article having a marking surface comprising a non-flat portion to be marked, the device comprising: a first laser unit for emitting and scanning first laser light over a first transfer area; a first foil unit for providing a first laser transfer foil at the first transfer area; a carrier for providing the article at the first transfer area, the article having a marking surface comprising a non-flat surface area; a first hard adaptor that is transparent for the first laser light, the first hard adapter having a first contacting surface that is essentially a negative of the non-flat surface area of the marking surface; and a contacting unit for bringing the first laser transfer foil in contact with the marking surface by causing the first contacting surface to move one of the first laser transfer foil and the marking surface towards one another.