Composite Vacuum Filter Bag for Airflow and Mechanical Stability
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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 power, often requiring dense protective layers that can become clogged with dust and are not suitable for modern non-woven plastic bags.
Innovation Solution
A composite material for vacuum cleaner filter bags comprising a first layer with high air permeability and a fiber layer made of man-made or plant fibers, connected via thermal methods like calendering or hotmelt, providing stability and flexibility while preventing layer displacement and clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If dense protective layers are used to protect sensitive filter layers from abrasion and impact, then mechanical stability and protection are improved, but air permeability is reduced and the layers become clogged with dust
Solution Approach 1:
The patent employs a porous protective layer with controlled porosity (5-50%) that maintains high air permeability while providing mechanical protection. The porous structure allows dust particles to pass through without clogging, unlike dense protective layers. The porosity is optimized to balance protection capability with airflow requirements, resolving the contradiction between mechanical stability and air permeability.
Solution Approach 2:
The filter bag uses a composite material structure consisting of multiple layers with different functions: a sensitive filter layer for particle separation, a porous protective layer for mechanical strength, and a non-woven fabric layer for structural stability. This composite approach allows each layer to be optimized for its specific function, enabling the system to achieve both high mechanical stability and maintained air permeability simultaneously.
2Strength
If traditional reinforcement layers such as paper are used, then mechanical strength is improved, but they cannot be welded and are not suitable for modern non-woven plastic bags
Solution Approach 1:
The patent changes the material parameter from traditional paper-based reinforcement to a thermoplastic polymer-based protective layer. This material parameter change enables the layer to be welded using standard welding processes (heat welding, ultrasonic welding, or adhesive welding) while maintaining or improving mechanical strength. The thermoplastic nature of the material allows for seamless integration with modern non-woven plastic bag manufacturing processes.
3Reliability
If the filter bag structure is optimized for high separation performance, then filtration efficiency is improved, but mechanical stability and resistance to unfolding are compromised
Solution Approach 1:
The filter bag is segmented into distinct functional layers: an inner sensitive filter layer for high separation performance, a middle porous protective layer for mechanical strength, and an outer non-woven fabric layer for structural stability and resistance to unfolding. This segmentation allows each layer to be optimized for its specific function without compromising the overall system performance. The layers work together synergistically to achieve both high filtration efficiency and mechanical stability.
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 achieves high mechanical stability and good usage properties with low elongation at maximum tensile force, ensuring the filter bag maintains performance and prevents clogging, suitable for both household and commercial use.
Implementation Method 1
The first layer (101) and the first fiber layer (102) are connected to one another, in particular by means of a thermal connection, in particular by means of a smooth calender or belt calender and bi-component fibers, melt-bonding fibers or hotmelt (hotmelt adhesive)
Data Source
Figure 1~3
AI summary
Vacuum cleaner dust filter bag has a composite wall with a first net layer of or a perforated foil with an air permeability of at least 10000 l/ (m2 s), and a first layer of fibres made of chemical or plant fibres joined to the net layer.