Filter-Bag Sealing and Cutting With a Circular Blade
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Solution Overview
Problem
Existing sealing and cutting devices for filter bags experience rapid wear of cutting components due to high elasticity of materials and require deactivation during cutting to prevent incorrect cuts, leading to reduced efficiency and component stress.
Innovation Solution
A sealing and cutting device with a circular blade and synchronized movement system, allowing simultaneous sealing and cutting without deactivating the sonotrode, using a cutting element with a circular blade that moves perpendicular to the feed direction, enhancing precision and extending component life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a linear knife and groove sonotrode are used for cutting, then cutting can be performed, but rapid wear of the cutting component occurs due to high elasticity of materials
Solution Approach 1:
The patent replaces the linear knife with a circular blade that rotates during the cutting process. This curved cutting element maintains constant contact with the material, distributing wear evenly around the blade circumference and preventing the rapid wear associated with linear knives. The rotational motion allows the blade to self-sharpen and maintain cutting effectiveness throughout its service life.
Solution Approach 2:
The cutting system transitions from a static linear knife to a dynamic rotating circular blade. The blade rotates during cutting, creating dynamic contact with the material that adapts to the elastic properties of the filter bag material. This dynamic approach allows the cutting edge to maintain optimal engagement with the material throughout the cutting stroke, preventing slippage and wear.
2Manufacturing precision
If the sonotrode is deactivated during cutting, then incorrect cuts are prevented, but sealing efficiency is reduced and component stress increases
Solution Approach 1:
The circular blade geometry allows for smooth, continuous cutting motion that naturally follows the contour of the material being cut. This curved path prevents erratic cutting behavior and eliminates the need to deactivate the sonotrode, as the rotational motion provides stable, controlled cutting throughout the process.
Solution Approach 2:
The system enables continuous operation where the sonotrode remains active throughout both sealing and cutting operations. The circular blade rotates continuously during cutting, maintaining constant useful action without interruption or deactivation, thereby maximizing productivity while maintaining cutting accuracy through the stability of rotational motion.
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 device improves cutting precision and extends the life of components by reducing wear and maintaining efficiency, enabling faster and cleaner cuts without fraying edges.
Implementation Method 1
a sonotrode for sealing the strip of filter material
Implementation Method 2
a cutting element or knife positioned on the anvil and able to separate the strip of filter material after sealing the strip
Data Source
AI summary
A sealing and cutting device for forming bags containing products includes; a sonotrode for sealing a portion of a continuous tubular strip, feeding along a feed direction; a counterhead positioned facing the sonotrode; a movement system for moving the sonotrode and/or anvil between a first non-operating position, wherein the sonotrode and the anvil are apart, and a second operating position wherein the sonotrode and the anvil are in contact to simultaneously seal a head and bottom of respective bags. A cutting element includes a circular blade connected to a supporting and movement element which imparts a translational movement to the blade with a circular shape along a direction perpendicular to the feed direction of the strip. The anvil includes a slit from which the blade protrudes, for cutting the strip, by contact with the sonotrode in the second operating position, to separate a bag formed from the remaining strip.