Polymer leaf disc filters are disc-shaped metal elements with two filtering faces, a centre ring and an outer edge. Filtalloy manufactures individual leaf discs for high-viscosity polymer melt filtration, using sintered metal fiber felt or sintered wire mesh as the filter medium.
Each disc is made to your operating requirements, drawing or existing sample. The filter layer, centre ring and outer edge can use different materials to suit the agreed design.
These are our commonly manufactured specifications. The stated maximum conditions can be used together in the corresponding disc design; the agreed drawing defines the material, medium and finished construction.
We have supplied leaf discs for BOPET, BOPP, BOPA and BOPI biaxially oriented film production, and for battery separator film production. These elements were manufactured to project drawings.
Sintered Fiber Felt with Retaining Strips
Sintered Fiber Felt with Outer Retaining Mesh
Retaining-strip construction: sintered metal fiber felt provides filtration, while the outer retaining strips secure the medium.
Retaining-mesh construction: sintered metal fiber felt remains the filter medium. The outer wire mesh holds the medium in place; the illustrated disc has no retaining strips. An outer retaining mesh does not mean that sintered wire mesh is the filtering layer.
We also manufacture discs with sintered wire mesh as the filtering medium. Specify the required media construction, nominal rating and installation dimensions when discussing a new or replacement disc.
Stainless steel 316 and 316L are commonly used. Special fiber-felt materials include:
The filter layer, centre ring and outer edge can be made from different materials. Select the combination for the polymer, temperature, corrosion conditions, cleaning method and welded design. See our sintered metal fiber felt materials and media.
Outside diameter, centre bore, finished thickness, centre-ring details and outer-edge dimensions can be customised. For a replacement disc, provide the mating dimensions, installation clearances and tolerances with the current drawing. Match the reference dimensions below to the agreed component drawing before manufacture.
| Dimension of polymer leaf disc filter | |||||||
| 4inch | 5inch | 6inch | 7inch | 8inch | 10inch | 12inch | |
| OD(mm) | 111 | 149 | 152.4 | 177.8 | 222 | 254 | 304.8 |
| ID(mm) | 47.6 | 47.6 | 38.2 | 63.5 | 76.2 | 85 | 115.5 |
| 38.1 | 38.1 | 47.6 | 63.5 | 47.6 | 85.2 | ||
| 47.6 | 76.2 | ||||||
| 63.5 | |||||||
| Remarks: Other dimensions could also be customized, such as OD 181mm/ OD 297mm. | |||||||
| Specification of Polymer Leaf Disc Filter | |||||
| Item | OD (mm) | OD (inch) | ID (mm) | Thickness (mm) | Filtration Area (m2) |
| ALY-PLDF-12065 | 304.8 | 12 | 85 | 6.5 | 0.12 |
| ALY-PLDF-12070 | 304.8 | 12 | 85 | 7 | 0.12 |
| ALY-PLDF-12063 | 304.8 | 12 | 63.5 | 6.5 | 0.13 |
| ALY-PLDF-12080 | 304.8 | 12 | 85 | 8 | 0.12 |
| ALY-PLDF-12075 | 304.8 | 12 | 85 | 7.5 | 0.12 |
| ALY-PLDF-12070 | 304.8 | 12 | 63.5 | 7 | 0.13 |
| ALY-PLDF-12063 | 304.8 | 12 | 63.5 | 6.5 | 0.13 |
| ALY-PLDF-11075 | 297.18 | 85 | 7.8 | 0.11 | |
| ALY-PLDF-11078 | 297.18 | 85 | 7.5 | 0.11 | |
| ALY-PLDF-07072 | 254 | 10 | 47.6 | 7.2 | 0.082 |
| ALY-PLDF-10065 | 254 | 10 | 85 | 6.5 | 0.08 |
| ALY-PLDF-08065 | 222 | 63.5 | 6.5 | 0.064 | |
| ALY-PLDF-07080 | 181 | 85 | 8 | 0.036 | |
| ALY-PLDF-07065 | 177.8 | 7 | 47.6 | 6.5 | 0.04 |
| ALY-PLDF-07085 | 177.8 | 7 | 85 | 6.5 | 0.029 |
| ALY-PLDF-06065 | 152.4 | 6 | 38.2 | 6.5 | 0.032 |
Each leaf disc has a fully welded construction made to the agreed drawing. Inspection covers the specified materials, outside diameter, centre bore, thickness, mating dimensions, welds, retaining structure and overall integrity.
Filter-media bubble point: tested according to ISO 4003.
Filter-media air permeability: tested according to ISO 4022.
The order defines inspection and acceptance requirements. Media tests are separate from the dimensional and integrity checks of the finished disc.
Our fully welded leaf discs are designed for cleaning and reuse while retaining their shape and structural integrity after the recommended cleaning process. Superheated steam, chemical cleaning and ultrasonic cleaning are available methods, selected for the polymer deposits, metal materials and welded construction.
Before reinstalling a cleaned disc, inspect the medium, welds, centre ring and outer edge. Confirm that the disc is clean, retains its shape and remains structurally intact.
A leaf disc filter provides two filtering faces for polymer melt filtration. We have supplied individual discs for BOPET, BOPP, BOPA and BOPI film production and battery separator film production.
State the required filtering medium, nominal rating, polymer, temperature, pressure, allowable pressure drop and dimensions. Our retaining-strip and retaining-mesh designs both use sintered fiber felt as the filtering medium. Sintered wire mesh discs are a separate media option.
Yes. The published 1–100 μm range is a nominal filtration rating. Confirm the required grade in the order specification.
Operating pressure describes the pressure in the process. Differential pressure is the pressure difference across the filtering element. Our stated maxima are 31.7 MPa operating pressure and 10 MPa differential pressure; the specified disc design must match the operating duty.
Yes. Our fully welded discs are designed to retain their shape and structural integrity after the recommended cleaning process. Superheated steam, chemical cleaning or ultrasonic cleaning can be selected to suit the polymer deposits and materials. Inspect cleanliness, the medium, welds and mating surfaces before reuse.
Yes. The filter layer, centre ring and outer edge can use different materials. We agree the material combination with the operating conditions and welded design.
Provide the polymer, nominal rating, flow, temperature, operating and differential pressures, cleaning method, quantity and drawing. Include outside diameter, centre bore, finished thickness, tolerances and mating details. If no drawing is available, send an existing sample so we can recover the dimensions and construction and confirm any uncertain specifications.
We supply individual leaf discs. Our supply scope for this product does not include complete disc stacks, centre pipes, gaskets, other accessories or filter housings.
Choose the route that matches your project. We manufacture individual leaf discs; your drawing and process conditions define the finished product.
Share the polymer, nominal rating, flow, temperature, operating pressure, allowable pressure drop, installation space and cleaning method. We work with you to define the media, material combination, retaining structure and finished dimensions.
Send the drawing, dimensions and tolerances, material, nominal rating and operating conditions. We manufacture individual replacement discs to the agreed drawing and specification.
Send an existing leaf disc if you have no drawing or complete data. We measure its dimensions and inspect its construction to recover the manufacturing details. Any material, original rating or operating requirement that cannot be established from the sample is confirmed with you before production.
Share your polymer duty, disc dimensions or drawing so we can review the required construction.
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Location:
Hi-Tech Industrial Zone, Hengshui,
Hebei, China, 053000
Contact:
+86 133 1308 7837
Email: info@alloyfilter.com
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