Laser Shell Marking on Mollusc Packaging Lines
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for marking molluscs, such as inkjet printing, fail to provide clear and readable identification due to the multi-colored and variable nature of their shells, making it difficult to ensure the origin of the product and protect against counterfeiting.
Innovation Solution
A packaging line equipped with a laser engraving device using carbon dioxide lasers to create visible markings by material subtraction, ensuring clear identification on mollusc shells, combined with a conveyor system and individualized housing trays for stable positioning and efficient marking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If inkjet printing is used to mark mollusc shells, then the marking process is simple and fast, but the legibility and visibility of the marking is poor due to multi-colored shell surfaces
Solution Approach 1:
The patent replaces the mechanical inkjet printing system with a laser-based marking system. The laser beam (electromagnetic energy) directly ablates or heats the shell surface to create permanent markings, eliminating the need for ink and mechanical contact. This substitution enables clear, high-contrast markings on multi-colored shells while maintaining high-speed operation.
Solution Approach 2:
The laser marking process creates color changes on the shell surface by altering the physical or chemical properties of the shell material. The laser heats or ablates the shell to produce dark-colored marks (carbonization or melt residues) that provide high contrast against the natural shell colors, ensuring excellent legibility regardless of the original shell coloration.
2Measurement precision
If laser power is increased to improve marking visibility, then marking clarity improves, but the risk of piercing the shell and harming the oyster increases
Solution Approach 1:
The laser marking process uses partial action by applying just enough energy to create visible markings without excessive power that would cause shell piercing. The system carefully controls laser parameters (power, pulse duration, scanning speed) to achieve the minimum necessary energy input for clear markings while staying below the threshold that would damage the oyster or pierce the shell.
Solution Approach 2:
The laser operates in pulsed mode rather than continuous wave, applying energy in periodic bursts. This allows the shell material to partially cool between pulses, preventing heat accumulation that could lead to shell piercing. The periodic action enables effective marking while controlling thermal damage to the live oyster.
3Productivity
If multiple lasers are used to mark all molluscs in a tray simultaneously, then marking productivity increases, but device complexity and cost increase
Solution Approach 1:
The system uses a single movable laser that dynamically scans across multiple shell positions rather than having multiple fixed lasers. The laser beam is directed by scanning mirrors or galvanometers that rapidly change the beam position, enabling one laser to perform the work of multiple lasers while reducing system complexity and cost.
Solution Approach 2:
A single laser unit is designed to perform multiple marking operations on different shells within a tray through rapid positioning and scanning capabilities. This universal laser serves the function of what would otherwise require multiple dedicated lasers, achieving high productivity while maintaining simpler device architecture.
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
The solution enables secure and systematic identification of molluscs, ensuring the origin of the product and protecting against counterfeiting, while maintaining the health and safety of live oysters through controlled heat exposure and adaptable power settings.
Implementation Method 1
Laser engraving allows for marking by subtracting material. Removing material from the surface of an oyster or other mollusk shell creates a color contrast that makes the marking clearly visible
Data Source
Figure 1~2
Figure 3~4
AI summary
Packaging line for externally shelled molluscs, comprising externally shelled mollusc loading trays (2) having mollusc receiving slots (5) and carried by a transfer conveyor (1), and an externally shelled mollusc marking device (10) comprising engraving means suitable for engraving an imprint on a shell, and control means suitable for controlling the engraving of the imprint on the shells of the molluscs arranged in slots of a loading tray (2).