Vacuum Cleaner Filter Bag Holding Plate for Low-Energy Ultrasonic Welding
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Solution Overview
Problem
The connection between traditional holding plates and vacuum cleaner filter bags is often problematic due to damage from ultrasonic energy during welding, leading to a weak bond that can unintentionally release, allowing dust to escape when the filter bag is removed.
Innovation Solution
A holding plate with a base plate made of a first plastic material and a connecting element of a second plastic material, specifically a thermoplastic elastomer, which allows for a strong connection via ultrasonic welding even with low energy input, using a higher melt flow index and lower melting temperature to enhance bonding properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ultrasonic welding is used to connect the holding plate with the bag wall, then the connection strength is improved, but the holding plate and sealing lip are damaged due to high ultrasonic energy
Solution Approach 1:
The patent changes the material parameters of the holding plate by using a two-component injection molding process. The first component provides structural integrity while the second component (with different melting temperature and melt flow index) is specifically designed for ultrasonic welding. This material parameter optimization allows the connection to achieve strong bonding without requiring excessive ultrasonic energy that would damage the holding plate or sealing lip.
Solution Approach 2:
The holding plate is constructed as a composite material system with two different plastic materials. The first plastic material forms the base structure, while the second plastic material (with higher melt flow index and lower melting temperature) is applied in the connection region. This composite structure enables selective bonding properties - the second material melts and bonds under ultrasonic welding conditions while the first material maintains structural integrity and resists damage.
2Object-affected harmful factors
If ultrasonic energy is minimized to avoid damage, then the holding plate and sealing lip are protected, but the connection between the holding plate and bag wall becomes weak and can be easily released
Solution Approach 1:
The patent optimizes material parameters including melt flow index and melting temperature of the second component. The second plastic material is selected to have a higher melt flow index and lower melting temperature than the first material, enabling it to melt and bond effectively at lower ultrasonic energy levels while still achieving strong connection strength.
3Reliability
If a seal membrane or rubbery-elastic layer is added between the holding plate and bag wall, then the sealing is improved, but the connection process becomes more complicated
Solution Approach 1:
The patent merges the sealing function and connection function into a single integrated structure. The second component of the holding plate serves dual purposes: it provides the bonding interface for ultrasonic welding to the bag wall and simultaneously acts as the sealing element. This eliminates the need for separate seal membranes or rubbery-elastic layers, simplifying the overall connection structure while maintaining reliable sealing.
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 solution provides a robust and reliable connection between the holding plate and the bag wall, reducing the risk of dust leakage and improving the ease of connection and disconnection of the filter bag.
Implementation Method 1
the base plate comprises a passage opening, and a connecting element of a second plastic material connected to the base plate by a material bond for connecting the base plate with the bag wall by a material bond, in particular by means of ultrasonic welding
Implementation Method 2
specifically a thermoplastic elastomer, which allows for a strong connection via ultrasonic welding even with low energy input, using a higher melt flow index and lower melting temperature to enhance bonding properties
Data Source
AI summary
The invention relates to a holding plate for a vacuum cleaner filter bag having a bag wall, the holding plate including a base plate made of a first plastic material with a passage opening, and a connecting element that is connected to the base plate by a material bond and is made of a second plastic material, for connecting the base plate to the bag wall by a material bond, in particular by means of ultrasonic welding, characterized in that the connecting element is arranged on the side of the base plate that is to be connected to the bag wall.