Laser Marking of Metallic Tab Stock for Container Closures
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for marking container end closures, particularly metallic tabs, face challenges such as high production costs, inefficiencies, and the need for frequent shutdowns due to the complexity of tools required for embossing or incising, and the unreliability of inkjet printing, which can lead to counterfeiting issues and operational disruptions in high-speed manufacturing processes.
Innovation Solution
A system and method that uses a servo feed unit to control the speed of a continuous sheet of material, allowing for more time to perform operations like marking, cutting, or shaping without slowing down the production line, utilizing a laser for marking and incorporating sensors to ensure accurate positioning of marks, enabling efficient and reliable marking of metallic tab stock that can be integrated with coil-fed production processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If embossing or incising processes are used to mark containers and tabs, then markings can be placed on container surfaces, but the process requires an undesirably large inventory of tools and frequent shutdowns to replace tools for maintenance or repairs
Solution Approach 1:
The patent replaces mechanical embossing/incising tools with a laser marking system that uses optical energy to mark tab stock. The laser system eliminates the need for physical contact between tools and the material, removing the requirement for tool inventories and tool replacement operations. The laser beam can be dynamically programmed to create different markings without any mechanical tool changes.
Solution Approach 2:
The laser marking system allows for dynamic changes in marking parameters (power, speed, pattern, duration) without requiring physical tool changes. By changing operational parameters rather than physical tools, the system achieves versatility while maintaining simplicity and reliability in high-speed production environments.
2Reliability
If embossing or incising processes are used to mark containers and tabs, then markings can be placed on container surfaces, but the process requires shutdowns of the assembly line or conversion press to replace tools for maintenance or repairs
Solution Approach 1:
The laser marking system operates without mechanical contact, eliminating the need for tool replacement and associated production line shutdowns. The system can perform maintenance or change markings continuously during production, maintaining high productivity while ensuring reliable marking operations.
Solution Approach 2:
The laser marking system enables continuous operation during production runs. The laser beam remains active and can be dynamically reprogrammed without interruption to the production line, ensuring both continuity of useful action and high productivity while maintaining reliability through consistent marking quality.
3Ease of manufacture
If inkjet printing is used to mark tabs, then markings can be applied to tab surfaces, but the process is unreliable and can lead to counterfeiting issues
Solution Approach 1:
The patent replaces inkjet printing (chemical deposition) with laser marking (thermal/ablation process). The laser directly modifies the tab stock material through controlled heating or ablation, creating permanent, tamper-evident markings that cannot be replicated by simple copying, thereby preventing counterfeiting while maintaining ease of manufacture.
Solution Approach 2:
The laser marking process uses controlled thermal parameters (temperature, exposure time, power density) to create authentic, permanent markings on tab stock. These parameter-controlled markings are inherently secure against counterfeiting while keeping the manufacturing process simple and efficient.
4Productivity
If the speed of a continuous sheet of material is increased to maintain high production rates, then productivity increases, but there is less time to perform operations like marking, cutting, or shaping
Solution Approach 1:
The laser marking system operates at the speed of light, allowing instantaneous marking of tab stock as it moves through the production line. This eliminates the time constraint imposed by mechanical marking systems, enabling high production rates while maintaining sufficient operation time for quality marking.
Solution Approach 2:
The laser system uses pulsed or modulated beam delivery synchronized with the material feed rate. This periodic action allows the laser to deliver precise energy doses at high speeds, maintaining marking quality while supporting increased productivity through rapid, repeated marking cycles.
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 allows for cost-effective, fast, and reliable marking of container end closures, reducing production downtime and preventing counterfeiting by enabling complex graphics and efficient operation at high speeds without increasing costs or slowing down downstream equipment.
Implementation Method 1
The laser unit can form an indicia on a continuous sheet of metallic tab stock
Implementation Method 2
The laser unit can form an indicia on a continuous sheet of metallic tab stock
Data Source
AI summary
A system and method of performing an operation on a continuous sheet of stock material is provided. More specifically, the present invention relates to a system and method used to perform an operation on a continuous sheet of stock material in a high speed manufacturing system. The continuous sheet of stock material can subsequently be received by a second system that performs a different operation on the continuous sheet of stock material. In one embodiment, the second system forms the continuous sheet of stock material into tabs for container end closures. The system can include an infeed accumulation device and an outfeed accumulation device. The infeed and outfeed accumulation devices enable the system to operate at a variable rate and out of phase with a high speed, coil fed manufacturing system to which the system may be removably integrated. The system can determine if the operation has been performed in at a predetermined location of a portion of the continuous sheet of stock material.