Pleated Mesh Screen Assembly with Segmented Retention Strips
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Solution Overview
Problem
Existing mesh screen assemblies for wastewater treatment facilities face issues with mesh shifting during molding, leading to poor retention and increased risk of mesh pull-out and ripping, especially in narrow stringers, which complicates visual inspection and affects filter efficiency.
Innovation Solution
The introduction of narrow retention strips on stringers with windows for high-pressure clamping and visual inspection, along with thermoplastic ridge bars and ribs, enhances mesh retention and support, allowing for improved filter area without increasing stringer thickness or plastic usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the mesh is partially embedded within the stringer material, then the stringer width can be minimized to maximize filter area, but the mesh retention is poor leading to pull-out and ripping
Solution Approach 1:
The stringer is segmented into a main body portion and a separate retention strip portion. The retention strip extends from the stringer body to provide additional mesh engagement area. This segmentation allows the stringer to maintain narrow width for filter area while adding dedicated retention functionality to prevent mesh pull-out.
Solution Approach 2:
The retention strip adds a dimensional extension from the stringer body, creating an additional engagement zone. By extending the retention structure beyond the stringer's main body, the patent increases mesh retention capability without significantly increasing the stringer's width, thus preserving filter area.
2Area of stationary object
If the stringer width is minimized to maximize filter area, then flow resistance is reduced, but visual inspection of mesh embedding becomes difficult
Solution Approach 1:
The retention strip is made with different material properties than the stringer body, creating a visual contrast that aids inspection. The retention strip may have different color, transparency, or surface characteristics that make it distinguishable from the stringer body, allowing easy visual detection of mesh embedding quality.
Solution Approach 2:
The retention strip acts as an intermediary element between the stringer body and the mesh. It provides a visible interface that facilitates inspection of mesh embedding, serving as a mediator that makes the embedding quality detectable while maintaining the narrow stringer width for maximum filter area.
3Reliability
If retention strips are added to improve mesh engagement, then mesh pull-out is reduced, but plastic material usage increases
Solution Approach 1:
The retention strip is applied locally at the critical mesh engagement zones rather than uniformly across the entire stringer. This localized approach provides enhanced mesh retention where needed while minimizing overall plastic material usage, optimizing the balance between retention performance and material efficiency.
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
This solution provides enhanced retention of mesh ends, reduces pull-out tension, and facilitates post-molding verification, ensuring proper mesh embedding and increased filter efficiency without excessive material usage.
Implementation Method 1
Injection of thermoplastic into these cavities provides an in-molding of the pleated mesh to assemble them into the panel
Implementation Method 2
The windows further provide the ability for post-molding visual inspection that can verify the full capture of the woven mesh within the molded material
Data Source
AI summary
A mesh screen, for example for filtration wheels used in water treatment, provides a set of pleated filter elements assembled by in-molding the mesh into stringers subdividing a frame. Retention strips following the pleated edges of the filter elements at the stringers include apertures permitting direct clamping of the mesh near the stringers and the ability to visually inspect, after molding, engagement between the molded elements and the mesh while providing an increased engagement area between the mesh and elements of the over-molded frame.