Rotary Laser Marking for Cork Stoppers
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Solution Overview
Problem
Current marking systems for cork stoppers face challenges such as high maintenance, consumable costs, labor-intensive processes, and inefficiencies in marking cylindrical surfaces at high speeds, particularly due to the limitations of existing laser technologies which struggle with variable frequency pulse generation and spatial modulation required for high-speed, high-definition marking on materials like natural cork.
Innovation Solution
A method and device utilizing laser radiation for rotational marking of cylindrical elements, allowing processing at variable speeds without the need for stamping or consumable inks, enabling continuous marking with electronic control, and capable of marking the entire perimeter of cork stoppers without contact, including irregular areas, with improved image quality and traceability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional offset printing or hot metal marking plates are used, then marking can be performed on cork stoppers, but maintenance costs, consumable costs, and labor requirements increase significantly
Solution Approach 1:
The patent replaces mechanical marking systems (hot metal plates, offset printing) with a laser-based marking system. The laser device uses optical fields and controlled radiation to mark cork stoppers, eliminating the need for physical stamping plates, ink application mechanisms, and associated mechanical complexity. This substitution reduces maintenance requirements and consumable management while maintaining marking consistency.
Solution Approach 2:
The patent uses digital pattern storage and optical projection to create markings. Instead of physical stamping plates that need to be manufactured, stored, and maintained, the system stores digital representations of marking patterns and projects them using laser radiation. This copying approach eliminates the need for physical plate management while preserving marking quality and consistency.
2Productivity
If high-speed marking is implemented, then productivity increases, but existing laser technologies struggle with variable frequency pulse generation and spatial modulation
Solution Approach 1:
The patent implements dynamic control of the laser system to adapt to varying marking requirements. The system uses variable frequency pulse generation and real-time spatial modulation capabilities that adjust according to the marking pattern and speed requirements. This dynamic approach enables high-speed marking while maintaining the flexibility to handle different pattern complexities without requiring overly complex fixed-frequency systems.
Solution Approach 2:
The patent incorporates feedback mechanisms that monitor the marking process in real-time and adjust laser parameters accordingly. The system uses sensors and control algorithms to detect position, speed, and marking quality, then dynamically adjusts pulse frequency, duration, and spatial distribution to optimize marking speed and quality simultaneously, resolving the contradiction between high productivity and control complexity.
3Manufacturing precision
If contact-based marking systems are used, then marking can be applied to cork stoppers, but the process requires stopping the machine to change marking plates
Solution Approach 1:
The patent replaces contact-based mechanical stamping with non-contact laser marking. The laser beam projects marking patterns onto the cork stopper surface without physical contact, eliminating the need for interchangeable stamping plates. This allows continuous operation at high speeds while maintaining marking precision through digital pattern control and optical focusing mechanisms.
Solution Approach 2:
The patent enables continuous marking operation by eliminating the need to stop the production line for plate changes. The laser system can rapidly switch between different marking patterns digitally and maintains continuous operation as cork stoppers pass through the marking zone, ensuring uninterrupted production flow while preserving marking accuracy through controlled laser parameters.
4Adaptability or versatility
If ink-based marking is used, then color variety is achieved, but a 24-hour drying process is required to fix ink on the stopper surface
Solution Approach 1:
The patent replaces ink-based chemical marking with laser-based thermal or ablation marking. The laser system uses controlled radiation to create permanent markings through thermal modification or material removal, eliminating the need for liquid inks and drying processes. This approach achieves permanent, high-contrast markings immediately upon completion of the laser scanning process.
Solution Approach 2:
The patent utilizes phase transitions of the cork material under laser irradiation to create permanent markings. The laser energy induces localized thermal effects that cause controlled charring, melting, or vaporization of the cork surface, creating permanent contrast patterns without requiring external inks or drying time. This phase transition approach enables immediate, permanent marking upon laser exposure.
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 solution significantly reduces maintenance, labor, and manufacturing costs, increases productivity, and enhances marking quality by eliminating the need for ink and solvent use, allowing for faster processing times and improved image reproduction on all surfaces of the stopper, including flat sides, while ensuring food safety and environmental responsibility.
Implementation Method 1
applying a continuous or pulsed laser radiation on the surface of the cylindrical element
Implementation Method 2
the intensity of affectation of the material proportional to the product of exposure time by the power density of the focused laser beam
Data Source
AI summary
The invention provides a method and device for rotary marking or machining of cylindrical materials, preferably natural cork stoppers, agglomerated cork or synthetic materials used to close wine bottles and the like. The device includes at least one feeder system of cylindrical elements, preferably natural and synthetic cork stoppers; means of sensing the presence of such cylindrical elements, a laser system, means to produce the rotation of the cylindrical elements on its axis of revolution, at a variable speed, in a tangential movement compared to the focal plane of the laser system, means of measuring the instantaneous velocity tangential to its surface and direction of rotation, optical correction and focusing means, microprocessor control based means, and means for extracting the cylindrical elements. The laser system comprises means of generating at least one laser beam; means of temporal modulation and switching for the laser beam, and means of spatial modulation of each of the laser beams in a synchronized manner with the instant tangential speed on the surface of the cylindrical element.