Leaf Disc Filters for Polymer Melt Filtration

We manufacture individual leaf discs with custom outside diameter, centre bore, finished thickness, centre-ring details and outer-edge dimensions. Existing specifications, mating dimensions or a reference sample can be used to define a replacement.

The filtration area is specified for the usable filtering region of the disc, with single-face or combined two-face area stated explicitly. Centre rings, outer edges and other masked regions are accounted for in the agreed design. Disc thickness and assembly spacing are checked separately.

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.

Use the media tests to verify the specified medium and the finished-disc checks to assess dimensions, mating features and integrity. The order records the methods and acceptance requirements for those inspection tasks.

Keep the cleaning history with the disc identity. Before reuse, check geometry, welds, ring/edge and sealing interfaces, compare resistance at aligned flow and fluid conditions, and perform the integrity or retention check required by the order. The metal filter troubleshooting guide and measured flow-pressure record tool help organize these checks into a documented reuse decision.

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 for cleanliness, shape and structural condition. Use these findings together with the required flow and integrity or retention results to decide on reuse.

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.

For an existing disc, start with its drawing or sample information. Identify the filtering medium separately from the outer retaining structure: the retaining-strip and retaining-mesh designs both use sintered fiber felt, while sintered wire mesh is a separate filtering-medium option. For a new selection, add the nominal rating, polymer, operating conditions and installation dimensions relevant to the duty.

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.

Start with the disc drawing, existing specification or sample information and required quantity. For a replacement, identify the outside diameter, centre bore, finished thickness and mating features that must match. For a new or changed duty, add the polymer, nominal grade, flow, temperature, operating and differential pressures and cleaning method. We can clarify the remaining construction and inspection details with you.

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.