Laser Surface Activation for Seal-Tight Plastic Housing Bonding
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Solution Overview
Problem
Existing methods for roughening surfaces using lasers are not effective in achieving improved bonding and seal-tightness between plastic housing parts, particularly in injection-molding processes, and are often costly.
Innovation Solution
A method involving the controlled use of a laser to create recesses of two different depths on the surface of plastic materials, producing active free radical carbons, which enhances chemical bonding by creating a plasma in the focal region, with the laser being directed in a pulsed manner to create point-like or groove-like recesses without a preferential direction, and incorporating spherical fillers for improved encapsulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional laser roughening methods are used, then surface roughening is achieved, but bonding effectiveness and seal-tightness between plastic housing parts are insufficient
Solution Approach 1:
The laser roughening process is segmented into multiple passes with different parameters. The first pass creates initial roughening with specific laser parameters, and subsequent passes apply different parameters to achieve optimal bonding surface characteristics. This segmentation allows independent optimization of each pass for different functional requirements.
Solution Approach 2:
The laser application uses periodic pulsing with specific duty cycles and frequencies. The laser is activated in periodic pulses rather than continuous operation, allowing controlled thermal accumulation and material removal. This periodic action enables precise control over the roughening depth and plasma generation timing.
2Reliability
If conventional laser roughening methods are used, then surface treatment is achieved, but the process is costly
Solution Approach 1:
The laser processing parameters are optimized to achieve multiple functions simultaneously: surface roughening for mechanical interlocking, plasma generation for chemical activation, and contaminant removal. This multi-functionality eliminates the need for separate treatment steps, reducing overall process cost while maintaining high seal-tightness.
Solution Approach 2:
The invention employs systematic variation of laser parameters including power, pulse duration, scanning speed, and wavelength to optimize the roughening process. By changing parameters within specific ranges, the process achieves cost-effective production while maintaining reliable bonding and seal-tightness performance.
3Reliability
If the laser creates deep recesses, then chemical bonding is improved through plasma production, but the surface structure becomes irregular and difficult to control
Solution Approach 1:
The laser parameters are dynamically adjusted during the roughening process based on real-time feedback and pre-programmed sequences. The laser power and pulse duration are varied dynamically to create the desired recess depth distribution, ensuring both chemical bonding activation and controlled surface geometry.
Solution Approach 2:
The laser roughening process performs preliminary surface preparation by creating controlled recesses and generating plasma before the injection molding operation. This preliminary action activates the surface chemically and mechanically, ensuring optimal bonding conditions are established prior to plastic housing attachment.
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 method achieves enhanced bonding and seal-tightness between plastic housings by creating a plasma that improves chemical bonding, resulting in improved encapsulation and reduced costs compared to prior art methods.
Implementation Method 1
the laser produces a plasma from the surface material, which is in particular advantageous for better chemical bonding in an injection-molding process
Implementation Method 2
the laser creates recesses of two different depths on the surface of plastic materials, producing active free radical carbons
Implementation Method 3
producing active free radical carbons, which enhances chemical bonding
Data Source
AI summary
A method for roughening a surface of a body by a laser, the laser acting on the surface of a body and thereby creating recesses in the surface, and the laser thereby being directed and guided onto the surface and set in terms of its power output in such a way that recesses with at least two substantially different depths are created in the surface of the body.