Multi-Ply Vacuum Cleaner Filter Bag for Dust Capacity and Airflow
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Solution Overview
Problem
Existing vacuum cleaner filter bags face challenges in coordinating dust collection capacity, air flow rate, and installation space constraints, leading to complex parameter management and unpredictable performance improvements with changes in filter layer thickness, density, or fiber geometry.
Innovation Solution
A vacuum cleaner filter bag design featuring a first filter layer composed of 3 to 25 individual dry-laid nonwoven plies with specific basis weights and permeabilities, and a second filter layer for improved filtration, where each ply is self-supporting and bonded only along the edge, enhancing dust-holding capacity and air permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness or grammage of the coarse filter layer is increased, then the dust-holding capacity is improved, but the air flow rate and suction performance deteriorate
Solution Approach 1:
The coarse filter layer is divided into multiple individual plies (3-25 plies, preferably 5-15 plies) of dry-laid nonwoven fabric, each with a basis weight of 5-50 g/m2 (preferably 8-30 g/m2). This segmentation allows the filter to achieve high dust-holding capacity through cumulative filtration surfaces while maintaining air permeability by using multiple thin layers instead of one thick layer, thus resolving the contradiction between dust capacity and air flow rate.
2Manufacturing precision
If the density of the filter layer is increased, then the filtration efficiency is improved, but the pressure loss increases
Solution Approach 1:
The filter system employs different densities at different stages: the segmented coarse filter plies have optimized local density for particle capture, while the fine filter layer provides high-density filtration for fine particles. This local quality differentiation allows efficient filtration without excessive pressure loss across the entire filter system.
3Quantity of substance
If the fiber geometry is changed, then the dust collection capacity is improved, but the air permeability is reduced
Solution Approach 1:
The filter system uses composite material structures: dry-laid nonwoven fabrics for the coarse filter layer with specific fiber geometries optimized for particle capture, combined with a fine filter layer for fine particle removal. This composite approach allows optimization of dust collection capacity in the coarse layer without compromising air permeability, as the fine filter layer handles the fine particle removal with its own optimized structure.
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 configuration significantly improves dust-holding capacity and suction air flow while maintaining low pressure loss, reducing the tendency to clog and ensuring effective filtration as both coarse and fine filter layers, with consistent performance across varying dust loads.
Implementation Method 1
a first filter layer and a second filter layer, wherein the first filter layer is in air flow direction arranged upstream of the second filter layer, and wherein the first filter layer comprises at least 3 and at most 25 individual plies, in particular at least 5 and at most 15 individual plies, wherein each individual ply is a dry-laid nonwoven fabric
Data Source
AI summary
The invention provides a vacuum cleaner filter bag comprising a first filter layer and a second filter layer, wherein the first filter layer is arranged upstream of the second filter layer in air flow direction, and wherein the first filter layer has at least 3 and at most 25 individual plies, especially at least 5 and at most 15 individual plies, wherein each individual ply is a dry-laid nonwoven having a basis weight of 5 g/m2 to 50 g/m2, especially having a basis weight of 8 g/m2 to 30 g/m2.