Filter Discs & Packs

Single disc vs multi-layer screen pack — what changes?

A single disc suits simple inline holders and some coarse duties. Extruder breaker plates and fine polymer filtration often use 2–5 layer packs with spot-welded periphery to maintain alignment under pressure and thermal cycling. Layer stack design follows retention target and approved industry patterns for your process — send current pack photo or layer list.

Extruder screen changers (manual or continuous) impose thickness and tab location limits — send changer manufacturer and model with plate drawing. Automatic systems often require tight thickness tolerance across the full pack stack.

Mesh count, weave and alloy for extrusion duty

Polymer melt filtration commonly uses dutch or reverse dutch weave in SS316L for corrosion and pore stability. Mesh count must be read together with weave — 80 mesh alone is incomplete. Note resin type, filler content, operating temperature and whether pack is reusable or sacrificial.

Graded packs may use coarse plain weave outer layers and fine dutch inner layers — list each layer mesh, weave and material rather than only final micron target. Trial packs can be quoted before annual supply contracts.

Dimensions and holder interfaces

Specify outer diameter, any inner hole or hub, bolt circle, tab slots and overall thickness after lamination. Holder brand and model help confirm fit. For non-round discs, send DXF or PDF with tolerances.

Non-circular discs (oval, slot, custom outline) require DXF or PDF with all radii dimensioned. Breaker plate hub bore and keyway must match extruder screw design — mismatches cause leak paths around the pack.

Spot welding, edge finish and cleanliness

Peripheral spot welds lock layers; edge burr condition affects sealing in some holders. Cleanliness or oil-free packaging is available when process validation requires — state this on RFQ.

Edge burr and peripheral weld nugget count affect sealing in some holders — note if your holder uses a knife edge or flat seat. Oil-free or bagged clean packs are available for medical or optical polymer lines when stated on RFQ.

What should I send for an accurate disc or pack quotation?

OD, layer list with mesh/weave/material per layer, quantity, process resin type and drawing or worn sample photo.

Reuse policy affects alloy choice: sacrificial packs may use SS304; corrosive or high-temperature lines typically specify SS316L throughout all layers. Document change control if layer stack is validated by your quality system.

MOQ, price bands and repeat supply

MOQ depends on layer count, diameter and alloy — typically lower for single discs, higher for multi-layer packs. Annual quantity and repeat schedule help lot planning; unit price confirmed per quote after spec lock.

See Extruder Screen and related family products below. Mesh layers reference Woven Wire Mesh dutch and plain families; multilayer welding beyond standard packs may route to Custom Fabrication for tooling-heavy builds.

Related products and next steps

Extruder screen and disc family products appear in the product range below. Mesh layers reference Woven Wire Mesh dutch and plain families for layer-stack design. Tooling-heavy multilayer or non-round packs may quote through Custom Fabrication when beyond standard lamination. Related blog posts on extruder filtration and mesh count help define layer stacks — send OD, layer list, resin type and holder model with your inquiry for extruder and inline holder applications.

Trial packs before annual supply help lock layer stack and thickness tolerance for automatic changers — note if your process allows a short validation run on sample quantity. Oil-free packaging, bagged sets and part-number marking per disc are available when your quality system requires traceability from pack to extruder line. Include change frequency and sacrificial vs reusable policy so alloy and layer depth match total cost of ownership.