Multilayer Vacuum Cleaner Filter Bag for Higher Dust Capacity
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Solution Overview
Problem
Existing vacuum cleaner filter bags have insufficient dust holding capacity due to high bulk density, which limits their dust storage capabilities.
Innovation Solution
A vacuum cleaner filter bag with a filter material comprising at least three layers, including two non-woven fabric layers connected by a minimal number of welded connections, achieving a low bulk density and high porosity to enhance dust storage capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional filter bags with higher bulk density are used, then structural strength is improved, but dust storage capacity deteriorates
Solution Approach 1:
The filter bag is divided into multiple functional layers (coarse filter layer, fine filter layer, support layer) with distinct pore size ranges. This segmentation allows each layer to contribute differently to filtration and structural integrity, enabling low bulk density while maintaining strength through optimized layer composition rather than uniform high-density material.
Solution Approach 2:
The filter bag uses composite material construction with at least three different layers having different fiber diameter distributions and pore sizes. The combination of coarse fibers for structural support and fine fibers for filtration creates a composite structure that achieves both strength and high dust storage capacity at low bulk density.
2Quantity of substance
If filter layers are densely packed to increase dust storage, then dust storage capacity is improved, but air flow resistance increases
Solution Approach 1:
Different layers have locally optimized properties: the coarse filter layer has large pores (0.5-5 μm) for high air flow and initial dust capture, the fine filter layer has smaller pores (0.1-1 μm) for fine dust filtration, and the support layer provides structural integrity. This local quality differentiation allows high dust storage capacity without uniform density that would restrict air flow.
Solution Approach 2:
The filter bag utilizes porous nonwoven material layers with controlled pore size distributions. The porous structure of each layer allows air permeability while the hierarchical pore sizes across layers maximize dust storage capacity without creating excessive flow resistance.
3Strength
If more welded connections are used to strengthen layer bonding, then structural integrity is improved, but bulk density increases
Solution Approach 1:
The patent applies welded connections at minimal necessary locations rather than uniformly across the entire filter bag surface. This partial action approach provides sufficient structural integrity for layer bonding while avoiding excessive welding material that would increase bulk density and reduce dust storage capacity.
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 filter bag design significantly increases bulkiness and dust storage capacity, outperforming previous designs by 15 to 42% in thickness and dust storage ability.
Implementation Method 1
the at least two non-woven fabric layers and the at least one non-woven fabric layer being connected to one another by a welded connection
Data Source
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Figure 10
AI summary
The invention relates to a vacuum cleaner filter bag which is made of a filter material and which comprises at least three layers. At least two layers consist of a non-woven fabric layer, and at least one layer consists of a non-woven fabric layer of fibres and/or filaments. The at least two non-woven fabric layers and the at least one non-woven fibre layer are connected together by a weld.