Composite Vacuum Cleaner Filter Bag for Airflow and Burst Strength
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Solution Overview
Problem
Conventional vacuum cleaner filter bags face challenges in achieving high mechanical stability without compromising air permeability and suction capacity, often resulting in reduced performance due to clogging and non-weldable protection layers.
Innovation Solution
A composite material for vacuum cleaner filter bags comprising a first layer with high air permeability, such as netting or perforated sheet, combined with a fibre layer made of man-made or vegetable fibres, connected through thermal bonding to enhance mechanical stability and prevent displacement, ensuring high tensile strength and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional protection layers are used to increase mechanical stability, then the bursting strength is improved, but the air permeability is reduced
Solution Approach 1:
The patent employs a porous non-woven fabric as the protection layer instead of compact materials. This porous structure allows air to pass through while still providing the necessary mechanical strength and protection to the filter bag, thus resolving the contradiction between bursting strength and air permeability.
Solution Approach 2:
The patent uses a composite structure combining different materials - specifically a non-woven fabric protection layer with appropriate filter layers. This composite approach allows each layer to contribute its specific properties: the non-woven fabric provides mechanical stability and protection while maintaining air permeability, and the filter layers provide filtration performance.
2Reliability
If compact protection layers are used to protect sensitive filter layers, then the protection function is improved, but the layers become clogged with house dust
Solution Approach 1:
The patent specifies using a porous non-woven fabric for the protection layer. The porous structure prevents clogging by allowing air and dust particles to pass through the layer rather than accumulating on it, while still providing the necessary protection to sensitive filter layers underneath.
3Reliability
If paper protection layers are used, then the protection function is improved, but the layers are not weldable
Solution Approach 1:
The patent changes the material parameter from paper to synthetic non-woven fabric. This parameter change enables the protection layer to be welded using standard plastic welding techniques, making it compatible with modern automated manufacturing processes while maintaining the protection function.
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 composite material achieves high mechanical stability and maintains good filtration properties while preventing clogging and maintaining air permeability, thus enhancing the overall performance and service life of the filter bag.
Implementation Method 1
a first layer consisting of a netting or a perforated sheet with an air permeability of at least 10,000 l/(m2 s)
Implementation Method 2
connected through thermal bonding to enhance mechanical stability and prevent displacement
Data Source
AI summary
The invention relates to a vacuum cleaner filter bag having a composite material comprising a first layer consisting of a netting or a perforated sheet with an air permeability of at least 10,000 l/(m2 s), and a first fiber layer consisting of man-made fibers and/or vegetable fibers and connected to one side of the first layer.