Self-Aligning Ultrasonic Welding for Sanitary Item Layers
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Solution Overview
Problem
Current welding apparatuses for absorbent sanitary items require manual adjustment of welding surfaces to achieve precise parallelism, which is time-consuming and prone to errors, leading to unacceptable welding defects and production waste.
Innovation Solution
The apparatus employs yielding coupling elements, such as elastic springs or air bearings, to automatically align the welding surfaces, ensuring perfect parallelism without manual intervention, using ultrasonic welding for precise and localized joining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual adjustment of welding surfaces is used to achieve precise parallelism, then welding quality is improved, but production time increases and errors are more frequent
Solution Approach 1:
The system performs self-alignment through the interaction between the yielding coupling element and the welding surfaces. When the welding surfaces come into contact, the yielding coupling element automatically adjusts to ensure parallelism without requiring external manual intervention, thereby eliminating adjustment time while maintaining high welding precision
Solution Approach 2:
The patent replaces the manual mechanical adjustment system with an automated system using yielding coupling elements (such as springs or air bearings) that automatically establish parallelism through physical interaction and force balance, substituting human operation with a self-regulating mechanical mechanism
2Manufacturing precision
If manual adjustment of welding surfaces is used, then welding quality can be improved, but welding defects increase due to operator errors
Solution Approach 1:
The self-aligning mechanism eliminates human operators from the adjustment process, removing the source of operator errors. The yielding coupling element automatically ensures correct alignment through its mechanical or pneumatic properties, making the process inherently more reliable and consistent
Solution Approach 2:
The yielding coupling element provides real-time mechanical feedback during the welding process. As the welding surfaces interact, the coupling element responds to any misalignment by adjusting its state (compression, expansion, or positional change), continuously guiding the system toward the correct parallel configuration
3Extent of automation
If yielding coupling elements are used for automatic alignment, then manual intervention is eliminated, but device complexity increases
Solution Approach 1:
The patent introduces yielding coupling elements with specific mechanical or pneumatic parameters (spring constants, air pressure levels) that enable automatic alignment. These parameter-based solutions provide automation through material properties and physical laws rather than complex control systems, balancing automation with manageable complexity
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 solution eliminates the need for manual adjustments, achieving high-quality welds efficiently and reducing production time and waste by ensuring accurate alignment of the welding surfaces.
Implementation Method 1
said second welding member comprises at least one yielding coupling element which allows said second welding surface to be arranged parallel to said first welding surface solely as a result of mutual contact between said welding surfaces
Implementation Method 2
yielding coupling elements, such as elastic springs or air bearings
Implementation Method 3
using ultrasonic welding for precise and localized joining
Data Source
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AI summary
The invention relates to an apparatus for mutually welding at least two elements of an absorbent sanitary item, comprising: - a supporting structure; - a first welding member associated with said supporting structure and comprising a first welding surface; - a second welding member (130) associated with said supporting structure and comprising a second welding surface (132). The second welding member (130) is movable with respect to the first welding member between: - a non-operating position, in which the second welding surface (132) is spaced apart from the first welding surface to allow at least two elements of the absorbent sanitary item to be positioned above the first welding surface, and - a welding position, in which the second welding surface (132) is in contact with the first welding surface to allow welding the at least two elements of the absorbent sanitary item. One of said first welding member and said second welding member (130) comprises at least one yielding coupling element (140) configured to allow a relative displacement between said first welding surface and said second welding surface (132) as a result of the mutual contact between the second welding member (130) and the first welding member. The invention further relates to a method for mutually welding at least two elements of an absorbent sanitary item, this method being implemented by the apparatus of the invention.