Coated Sonotrode Inlet for Low-Damage Ultrasonic Welding
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Solution Overview
Problem
Existing sonotrodes cause damage to materials, especially nonwovens, during ultrasonic processing due to friction and improper feeding angles, leading to impaired product quality and reduced production speed when multiple layers are welded together.
Innovation Solution
A sonotrode with a convexly curved inlet section and a coating on the sealing surface, designed with specific radii of curvature and recesses, reduces friction and minimizes material damage while maintaining production speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the sonotrode uses a flat sealing surface for ultrasonic processing, then the processing speed can be maintained, but the material suffers damage due to high friction and improper feeding angles
Solution Approach 1:
The sealing surface of the sonotrode is designed with a convex curvature instead of a flat surface. This curved geometry allows material to be fed in at an optimized angle, reducing friction and preventing damage while maintaining processing speed. The curvature radius is specifically chosen to balance material handling with ultrasonic welding effectiveness.
2Object-affected harmful factors
If the sonotrode geometry is optimized to reduce material friction, then material damage decreases, but the ultrasonic processing effectiveness is reduced
Solution Approach 1:
Different regions of the sonotrode sealing surface have different properties: the inlet portion has a specific convex curvature to reduce friction and guide material, while other portions maintain the geometry needed for effective ultrasonic welding. This local differentiation allows simultaneous optimization of material handling and processing effectiveness.
3Adaptability or versatility
If multiple layers of material are fed from different directions into the gap, then resource utilization is improved, but material damage increases due to rubbing over edges
Solution Approach 1:
The convex curved inlet section provides a gradual transition surface that guides multiple material layers into the processing gap without sharp edges that would cause rubbing and damage. This curvature enables versatile multi-layer processing while protecting material integrity.
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 design effectively reduces material damage and maintains production speed by minimizing friction and ensuring stable coating adherence, even when processing multiple layers from different directions.
Implementation Method 1
The sonotrode of the device is set into ultrasonic vibration. The direction of propagation of the ultrasonic vibration runs between the rear surface and the sealing surface of the sonotrode. The ultrasonic vibration of the sonotrode causes localized heating of the material located in the gap between the sealing surface of the sonotrode and the sealing surface of the counter tool.
Implementation Method 2
The ultrasonic vibration of the sonotrode causes localized heating of the material located in the gap between the sealing surface of the sonotrode and the sealing surface of the counter tool. The localized heating in turn causes the different layers of material arranged in the gap to fuse together
Data Source
AI summary
A sonotrode or ultrasonic welding apparatus for ultrasonically processing a material, including a sealing surface adapted to contact the material to be processed, a rear surface opposite to the sealing surface, and a circumferential lateral surface connecting the sealing surface to the rear surface, the lateral surface having two side surfaces arranged substantially parallel to each other and two end surfaces arranged substantially parallel to each other. In order to provide a sonotrode or ultrasonic welding apparatus for processing a material, which at least reduces damage to the material and at the same time does not impair the production speed, it is proposed that the sealing surface has a convexly curved inlet section which adjoins the lateral surface, and wherein the sealing surface has a coating at least in a section.