Biodegradable Multi-Layer Dust Filter Bag With Wet Strength
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Solution Overview
Problem
Vacuum cleaner filter bags made from synthetic materials are not biodegradable and pose environmental concerns, while paper-based bags are prone to bursting when exposed to moisture and have poor fitment issues, leading to inefficient dust collection and increased usage.
Innovation Solution
Development of dust filter bags using biodegradable fibers and filaments from renewable resources, such as cellulose and polylactic acid, with a multi-layer structure comprising a coarse filter layer, fine filter layer, and support layer, thermally welded together without additional adhesives, ensuring compostability and improved environmental balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synthetic multi-layer filter structures are used, then dust absorption performance is improved, but biodegradability is lost and environmental burden increases
Solution Approach 1:
The patent uses composite filter materials combining synthetic polymers (for dust absorption) with natural fibers like cellulose and chitosan (for biodegradability). This composite structure allows the filter to maintain effective dust filtration while the natural fiber components enable partial biodegradation, reducing environmental burden compared to purely synthetic filters.
Solution Approach 2:
Different regions of the filter bag have different material compositions. The filter media contains zones with varying proportions of synthetic and natural fibers, allowing areas with higher dust absorption needs to use more synthetic material while other areas use more biodegradable natural fibers, optimizing both performance and environmental compatibility.
2Object-generated harmful factors
If paper-based bag wall layers are used, then biodegradability is improved, but wet strength decreases and bursting resistance is reduced
Solution Approach 1:
The bag wall layers are constructed as composites of paper (providing biodegradability) and synthetic fibers or coatings (providing wet strength). This composite structure allows the filter bag to maintain structural integrity when wet while remaining biodegradable, as the paper component can decompose after use.
Solution Approach 2:
The patent uses intermediate materials such as biodegradable polymers or natural fiber coatings as mediators between the paper structure and the synthetic filter media. These intermediary layers protect the paper from direct water exposure while allowing vapor transmission, maintaining both wet strength and biodegradability.
3Object-generated harmful factors
If paper-based filter bags are used, then biodegradability is improved, but stiffness increases and fitment to dust collection space becomes difficult
Solution Approach 1:
The filter bag structure uses localized reinforcement with synthetic materials at critical connection points and seams, while the main body retains paper construction for biodegradability. This selective material distribution provides structural support where needed without compromising overall flexibility and fitment capability.
Solution Approach 2:
The patent incorporates flexible synthetic components that can dynamically adjust to the dust collection space geometry. These dynamic elements allow the paper-based filter bag to conform to various housing shapes while maintaining structural integrity, improving fitment adaptability without sacrificing biodegradability of the main filter media.
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 biodegradable filter bags maintain strength when exposed to moisture and can be composted, reducing environmental impact while optimizing dust collection efficiency by utilizing renewable materials effectively.
Implementation Method 1
the filter material consists of biodegradable fibers and/or filaments... can be composted after use... For the purposes of the invention, biodegradable means a loss of strength of greater than or equal to 40% on a measuring strip if it has been treated in accordance with the conditions from ASTM 5338-98
Implementation Method 2
a multi-layer filter structure and the use of a multi-layer filter structure for dedusting fluids... at least one coarse filter layer, at least one fine filter layer and at least one support layer
Implementation Method 3
The individual layers are connected to each other at defined points... thermally welded together without additional adhesives
Data Source
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AI summary
The filter bag has a top layer and a bottom layer formed of multi-layered filter material (5). The filter material comprises a coarse filter layer (6), a fine filter layer (7) and a supporting layer (8), which are connected with each other at defined areas. The filter material comprises biodegradable fibers and/or filaments made of natural polymers. The natural polymers are formed on the basis of cellulose. The fibers are formed as viscose fibers on the basis of cellulose. The fibers and/or the filaments are formed of polylactic acid or polysuccinic acid on the basis of thickness.