Bag Filter Fabric With Layered Aramid Fibers
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Solution Overview
Problem
Conventional bag filters face issues with decreased dust collection performance due to abrasion or cracking, leading to increased energy consumption and reduced breathability, especially when using high-fineness materials or PTFE membrane filters.
Innovation Solution
A filter fabric is developed by laminating nonwoven fabrics with specific single-fiber fineness and meta-type aramid fibers on both sides of a base fabric, ensuring high tensile strength, elongation, and crimping, which maintains excellent collection performance and low pressure drop even after abrasion, with a porosity range of 75-90%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-fineness material is used for dust collection, then collection performance is improved, but breathability decreases and energy consumption increases
Solution Approach 1:
The patent applies local quality by using short fibers with different fineness (0.3-0.9 dtex for nonwoven fabric A, 0.3-4.0 dtex for nonwoven fabric B) in different regions/layers of the filter fabric. The finer fibers (0.3-0.9 dtex) provide excellent dust collection performance for fine particles, while the coarser fibers (0.3-4.0 dtex) maintain breathability and reduce pressure drop. This layered approach with varying fiber fineness allows the filter to simultaneously achieve high collection efficiency and low energy consumption.
2Reliability
If a PTFE membrane film is used for fine dust collection, then collection performance is improved, but the filter becomes thin and susceptible to abrasion and cracking
Solution Approach 1:
The patent employs composite materials by combining short fibers (meta-type aramid fibers with specific fineness) into a nonwoven fabric structure. This composite approach creates a three-dimensional network that distributes stress throughout the material, providing both fine dust collection capability and high resistance to abrasion and cracking. The interlaced fiber structure prevents the thinness and fragility issues associated with membrane films while maintaining effective filtration.
3Device complexity
If conventional nonwoven fabric is used for bag filter, then structure is simple, but dust collection performance decreases due to abrasion or cracking
Solution Approach 1:
The patent applies parameter changes by specifying precise fiber fineness ranges (0.3-0.9 dtex and 0.3-4.0 dtex), tensile strength (2.2 cN/dtex or more), elongation (25% or more), and crimp characteristics (6-30 crimps/2.54 cm). These controlled parameter variations within the nonwoven fabric structure enhance durability and dust collection performance while maintaining relative structural simplicity. The meta-type aramid fiber material selection further optimizes these parameters for improved reliability.
Data Source
AI summary
The invention addresses the problem of providing a filter fabric for a bag filter, which has excellent collection performance and low pressure drop and is resistant to a decrease in dust collection performance due to abrasion or cracking, and also a method for producing the same. Means for resolution is a filter fabric for a bag filter in which a nonwoven fabric A including short fibers a having a single-fiber fineness of 0.3 to 0.9 dtex, a base fabric, and a nonwoven fabric B including short fibers b having a single-fiber fineness of 0.3 to 4.0 dtex are laminated in this order.