Ultrasonic Web Bonding With Adaptive Amplitude Control
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Solution Overview
Problem
Existing technologies for producing ultrasonically bonded cross seals in nonwoven materials fail to maintain consistent bond quality at high production speeds, leading to weak, uneven bonds, low yield, and machine wear due to overwelding, necessitating operator intervention.
Innovation Solution
A system with a controller that adjusts force and position based on real-time feedback from sensors to ensure consistent bond strength and quality, using closed-loop control and adaptive amplitude regulation to stabilize ultrasonic energy delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If production speed is increased above 175-200 units per minute, then productivity improves, but bond quality deteriorates with weak and uneven bonds
Solution Approach 1:
The system implements real-time feedback control by monitoring the actual bond force during ultrasonic bonding and comparing it to the target bond force. The controller automatically adjusts ultrasonic parameters (amplitude, power, duration) based on this feedback to maintain consistent bond quality even at high production speeds above 200 units per minute
Solution Approach 2:
The system dynamically adjusts ultrasonic bonding parameters in real-time during operation. The controller modifies amplitude, power, and duration parameters on-the-fly based on measured bond characteristics, enabling consistent bond quality across varying production speeds without manual intervention
2Strength
If bond force control parameter is increased to compensate for weak leading bonds, then leading bond strength improves, but trailing bonds become overwelded causing machine wear
Solution Approach 1:
The system applies different ultrasonic bonding parameters for leading and trailing bonds based on their specific requirements. The controller detects bond position and adjusts amplitude, power, or duration independently for each bond location, ensuring optimal strength for leading bonds without overwelding trailing bonds
Solution Approach 2:
The system changes ultrasonic bonding parameters (amplitude, power, duration) based on bond position and real-time measurements. By modifying these parameters dynamically, the system achieves consistent bond strength across all positions without excessive force that would cause overwelding and machine wear
3Manufacturing precision
If operator configuration and parameter tweaking is performed during production, then bond quality can be optimized, but operational complexity and downtime increase
Solution Approach 1:
The system performs self-optimization by automatically detecting bond characteristics and adjusting ultrasonic parameters without operator intervention. The controller continuously monitors bond force and autonomously tweaks parameters to maintain optimal bond quality, eliminating the need for manual configuration and reducing operational 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
Achieves consistent bond strength variability below 10%, reduces machine wear, and eliminates the need for operator adjustments, enhancing production efficiency and product quality to six sigma levels.
Implementation Method 1
a joining device for treating one or more workpieces during a treatment operation... at least one of a bonding operation, a welding operation, a soldering operation, a fusing operation
Implementation Method 2
producing ultrasonically bonded cross seals... ultrasonic energy delivery
Data Source
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AI summary
An apparatus having a first treatment module and a second treatment module positionable in proximity to the first treatment module, wherein at least one of the first treatment module and the second treatment module includes a welding device for treating one or more workpieces. The apparatus has a controller arranged to: receive a real-time amplitude signal of ultrasonic vibration of at least one of the first treatment module and the second treatment module during a treatment cycle; segment the amplitude signal into a plurality of amplitude segments for the treatment cycle; monitor an amplitude value of each of the plurality of amplitude segments during the treatment cycle; operate a plurality of closed-loop control algorithms to determine a plurality of amplitude adjustment values, each of the plurality of amplitude adjustment values corresponding to a respective one of the plurality of amplitude segments; and apply each amplitude adjustment value to the corresponding respective one of the plurality of amplitude segments during the subsequent treatment cycle in real-time. The treatment cycle comprises treating a single workpiece in a plurality of workpieces, and the treating including a bonding operation, a welding operation, a soldering operation, a fusing operation, or a cutting operation.