CHG Metal manufactures leaf filter screens for pressure leaf filtration, replacement mesh and pre-cut screen packs. Screens can use Plain Dutch Weave, Twill Dutch Weave or support mesh, selected by target micron, flow, pressure drop, cleaning method and old-frame dimensions.
Screen Formats and Weave Selection
PDW suits medium fine filtration and higher flow; TDW suits finer apertures and precision retention; RPDW and support mesh are used for specific flow or structural requirements. Screens can be supplied as individual replacement mesh, pre-cut packs or screen packs combined with support layers and drainage core.
Upgrading to high-precision leaf filter screens ensures superior clarification efficiency and longer mesh life:
| Operational Parameter | Standard Commercial Wire Cloth | Our Precision Leaf Filter Screens |
| Aperture Uniformity | Varying pore size (Particle bypass risk) | Strict Micron Tolerance (Guaranteed flow retention) |
| Wire Tensile Strength | Standard mill wire (Susceptible to sagging) | High-Tensile Drawn Wire (High pressure resistance) |
| Surface Smoothness | Rough weave knuckles (Cake sticks to mesh) | Calendered/Rolled Surface (Instant, clean cake drop) |
| Edge Stability | Fraying raw edges during handling | Laser-Cut & Ultrasonic Sealed Edges (Zero fraying) |
| Fatigue Resistance | Early wire breakage under vibration | Optimized Crimp Geometry (High vibratory life) |
| Re-meshing Compatibility | Hard to align evenly on old frames | Precision Pre-Cut Sheet Packs (Rapid field installation) |
Key Performance Advantages Rooted in Our Manufacturing Process
Precision Surface Calendering: Filtration mesh packs undergo controlled surface calendering (rolling) to flatten weave knuckles, creating a smooth plane that promotes effortless cake release and reduces pre-coat usage.
Automated Laser Cutting: Screen sheets are pre-cut using high-precision CNC laser systems to exact frame templates, eliminating raw edge fraying and ensuring perfect perimeter fitment inside C-channel frames.
Rigid Quality Inspection: Every screen batch undergoes bubble point testing and optical aperture verification to guarantee accurate micron ratings and zero weave defects prior to dispatch.
FAQ
Q: What is a leaf filter screen?
A: It is the filtration mesh surface used on a pressure leaf. It can be supplied as an individual screen, a pre-cut pack or part of a complete leaf assembly.
Q: What is the main advantage of using calendered Dutch weave mesh for leaf filter screens?
A: Calendering flattens the raised knuckles of the woven wire cloth. This creates a smoother filtration surface that drastically improves filter cake detachment during vibration while preventing diatomaceous earth particles from embedding in the wire intersections.
Q: Are these leaf filter screens supplied as individual mesh sheets or complete pre-assembled layer packs?
A: We offer both options. You can order single-layer replacement filtration cloth, or complete pre-cut, multi-layer screen packs (fine filter mesh + intermediate support mesh + drainage core) tailored to your specific frame dimensions for fast re-meshing.
Q: How do I select between Plain Dutch Weave (PDW) and Twill Dutch Weave (TDW) for my screens?
A: Plain Dutch Weave provides higher mechanical strength, higher liquid flux, and easier cleaning-ideal for standard pre-coat applications down to 20–30 microns. Twill Dutch Weave allows a tighter weave density for fine sub-micron or micro-clarification applications down to 5–10 microns.
Q: Can you supply replacement screens for an existing frame?
A: Yes. Send the old screen or dimensions, mesh count, material, cut direction and edge-fixing method, and we can prepare the replacement screen.
Q: What information is needed for a quotation?
A: Please provide screen size, mesh count, weave, micron rating, material, edge type, frame dimensions, quantity and inspection requirements.
Request a Quote
Send the screen size, mesh count, weave, micron rating, material, edge type, old-frame dimensions and quantity to CHG Metal for a leaf filter screen quotation.
