Laser Welding Web Platen Arcuate Surface Contact
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Solution Overview
Problem
Existing non-contact joining techniques for plastic materials are limited in throughput and flexibility, particularly when forming welds that are not collinear with the travel path of the web, and require significant changes to equipment and process for different weld patterns.
Innovation Solution
A web processing system that uses a laser welding apparatus supported by a gantry, capable of moving along multiple axes, to form weld patterns on continuously fed webs, with a platen having an arcuate surface and adjustable elements to maintain intimate contact between webs without direct pressure, and incorporates features like static attraction and cooling systems to enhance the welding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If prior non-contact joining techniques are used to form welds, then joining of plastic materials is achieved, but throughput is limited and flexibility for different weld patterns is reduced
Solution Approach 1:
The patent employs a dynamic laser beam scanning system that can rapidly change welding patterns without physical reconfiguration. The laser beam is controlled to move along complex paths (collinear, transverse, or custom patterns) by dynamically adjusting beam position and travel speed, enabling high throughput while maintaining flexibility for different weld patterns.
Solution Approach 2:
The system changes operational parameters (laser power, beam scan speed, scan pattern) to achieve different welding configurations. By varying these parameters, the same equipment can produce diverse weld patterns across the web material, improving both productivity and adaptability without requiring physical tooling changes.
2Adaptability or versatility
If prior techniques are used for forming welds in various patterns, then joining is achieved, but significant changes to equipment and process are required
Solution Approach 1:
The laser welding system is designed as a universal platform that can perform multiple welding functions (collinear welds, transverse welds, complex patterns) through software control of the laser beam path. This multi-functionality eliminates the need for different equipment configurations while maintaining the ability to produce various weld patterns.
Solution Approach 2:
The patent replaces mechanical reconfiguration systems (physical tooling changes, equipment repositioning) with a computer-controlled laser beam scanning system. The beam can be directed to any pattern through digital programming, substituting complex mechanical adjustment mechanisms with optical control and software programming.
3Reliability
If laser beam is used to heat web material for joining, then non-contact welding is achieved, but control of web contact and weld quality becomes challenging
Solution Approach 1:
The system incorporates feedback control through sensors that monitor web position, laser beam position, and welding parameters in real-time. This feedback enables automatic adjustment of beam focus, scan speed, and power to maintain consistent weld quality while accommodating variations in web contact and material properties.
Solution Approach 2:
The patent uses an intermediary control system (computer control interface) that coordinates between the laser beam generation, beam positioning system, and web conveyance. This intermediary controller synchronizes the laser operation with web movement and contact conditions, simplifying operation while ensuring reliable weld quality.
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 rapid and flexible formation of various weld patterns on plastic web materials with increased throughput and reduced process complexity, allowing for efficient production of complex products without the need for tooling changes.
Implementation Method 1
a focused laser beam is used to heat the web material to a temperature sufficient to join the multiple layers
Implementation Method 2
incorporates features like static attraction and cooling systems to enhance the welding process
Data Source
AI summary
A web processing system for laser welding at least two continuous webs includes a supply station for supplying the webs and a lamination station for laser welding the webs together in a pre-determined pattern. The lamination station includes a platen having a platen surface between leading and trailing ends thereof across which the webs are conveyed and a laser welding apparatus offset from the platen surface and configured to direct a laser beam to said platen surface to laser weld the webs in the pre-determined pattern. In one aspect, the platen surface is arcuate so that the webs are maintained in intimate contact across the platen surface.