Steered Laser Focal Point for Moving Web Processing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing laser systems require increased power density to process moving web-based materials at higher speeds, limiting processing efficiency as they cannot maintain effective energy transfer with a fixed laser beam at speeds above an ideal threshold.
Innovation Solution
A steered laser system using a galvanometer to move the focal point of the laser beam at a speed less than the moving web, effectively reducing the web's speed relative to the focal point, allowing for higher processing speeds without increasing laser power density by controlling the focal point's movement with a controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a fixed laser beam is used to process moving web-based material, then the laser can maintain a stationary focal point, but the processing speed is limited and requires increased power density for higher speeds
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a fixed stationary laser beam to a dynamic steered laser beam that moves in synchrony with the web material. The galvanometer system enables the focal point to track and move with the material at variable speeds, allowing the processing speed to increase without requiring proportional increases in laser power density. This dynamic adaptation resolves the contradiction by making the laser system responsive to material speed variations.
Solution Approach 2:
The patent implements parameter changes by varying the focal point position and movement speed as control parameters. By adjusting the galvanometer's steering angles and the focal point's velocity relative to the material, the system optimizes energy delivery at different processing speeds. This parameter adjustment allows maintaining effective processing across a range of speeds without linearly increasing power density requirements.
2Productivity
If the web material moves at higher speeds, then productivity increases, but the laser requires more power density to maintain effective processing
Solution Approach 1:
The steered laser system dynamically adjusts the focal point's movement to match the web material's speed, enabling higher productivity without proportionally increasing power density. The galvanometer system allows the laser to maintain effective coupling with the material across varying speeds, resolving the productivity-power density contradiction through real-time motion coordination.
Solution Approach 2:
The patent ensures continuous useful action by maintaining the laser focal point's engagement with the moving material without interruption or loss of energy transfer efficiency. The steered beam continuously tracks the material, ensuring that the useful laser action remains uninterrupted even at high speeds, thereby increasing productivity without requiring excessive power density spikes.
3Speed
If a fixed laser beam is used, then the system is simpler, but the focal point cannot follow the material movement effectively at variable speeds
Solution Approach 1:
The patent introduces dynamic elements (galvanometer mirrors, motion control system) that enable the focal point to follow material movement at variable speeds. While this increases device complexity, it provides the necessary speed adaptability. The complexity is justified by the significant gain in operational flexibility and processing capability across different material speeds.
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
Enables efficient laser processing of moving web-based materials at speeds significantly higher than the ideal speed without increasing power density, enhancing processing efficiency and reducing the need for more powerful lasers.
Implementation Method 1
many plastic films absorb only a fraction of the laser energy at CO2 wavelengths
Implementation Method 2
high-power laser beams for cutting, slitting, scoring, marking and other related laser processing
Implementation Method 3
focused laser beam to cause local vaporization or degradation of the material
Data Source
AI summary
Systems and methods are described for efficient laser processing of a moving web-based material. In one embodiment, a moving web is provided at a selected speed. A laser beam is generated having a focal point positioned to provide either a score or cut in the web. The focal point of the laser beam is moved at a speed less than the selected speed for a selected distance thereby producing a discreet score or cut in the web in the machine direction. The focal point is repositioned to form another discreet score or cut once the prior discreet score or cut is formed. The repositioned focal point is moved at a speed less than the selected speed for another selected distance. The step of repositioning is repeated to form a plurality of discreet scores or cuts in the web moving at the selected speed. The laser beam is therefore able to be generated using less power than would be needed to produce the same type of discreet score or cut if the focal point were stationary as the web is moved at the selected speed.