Drawing-based manufacturing

Screen packs

Replaceable screen packs for polymer-melt filtration, from loose and spot-welded stacks to rimmed and diffusion-bonded assemblies. Layer sequences include 20/40/20 and 40/80/200/80/40 mesh. Each pack is defined by the inlet-to-outlet layer schedule, wire and aperture, support, finished thickness and screen-changer interface.

Send your drawing Configurations

Layer example: 20 / 40 / 20 mesh
Five-layer example: 40 / 80 / 200 / 80 / 40
Assembly: Loose · spot-welded · rimmed

Metal filtration componentsScreen pack configurations

Choose by installed outline

Screen pack configurations

Start with the cavity shape and changer interface, then define layer sequence, support and joining method.

Round screen packs

Circular multilayer packs for round breaker plates and screen cavities.

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Kidney and oval packs

Non-round packs matched to changer cavities and flow passages.

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Screen packs

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3 products

Round screen packsSpot-welded layers

Multilayer screen packs

Multilayer screen packs combine a filtering mesh with selected support and drainage layers in one installable assembly.

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Round cut and rimmed woven filter discs showing separate disc and captured-edge constructions

Round screen packsRimmed pack

Rimmed extruder screen packs

Rimmed woven screen packs for melt filtration.

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Engineering outline diagram of a kidney-shaped screen pack with a curved perimeter

Kidney and oval packsSpot-welded layers

Kidney-shaped screen packs

Non-round woven packs for screen-changer pockets.

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Compare screen packs

Multilayer extruder screens with loose, spot-welded or rimmed edges. Round, annular and kidney-shaped packs combine a fine separation layer with support layers that fit the breaker plate or screen changer.

Construction	Application and fit	Confirm first	Find a product
Round screen packs	The installation uses a round cavity and defined outside diameter.	OD, layer sequence, orientation, support and thickness.	Filter matching products
Kidney and oval packs	The screen changer uses a kidney, oval or similar cavity.	Controlled outline, orientation, layer sequence and locating features.	Filter matching products

Layered packs, retained rims and shaped outlines

Multilayer wire mesh screen packs — A defined stack combines the filtering layer with protection, drainage and backing in the specified order.

Round extruder screen packs with metal rims — The perimeter ring keeps the layers together and establishes the finished edge inside the changer seat.

Kidney-shaped multilayer screen packs — The shaped outline and locating features match the screen-changer pocket and its flow window.

What we need to build a pack

Define the layer sequence, alloy, differential-pressure load and fitted dimensions together as one complete pack.

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Layer schedule

List layers from upstream to downstream, including mesh count, wire diameter, weave and alloy. Configurations such as 20/40/20 or 40/80/200/80/40 identify layer order; the downstream backing layer bridges the breaker-plate holes. Include finished pack thickness and flow direction.

Changer cavity

Provide outside profile, centre hole, seating land and maximum finished stack height.

Melt conditions

Include polymer, recycled content, throughput in kg/h, melt temperature and contaminant type.

Pressure trend

Record differential pressure at clean start and at changeover at comparable throughput and temperature.

Retention rating

State the control-layer clear aperture in µm. Specify the test method used to establish nominal or absolute particle retention.

Handling and installed height

Specify loose, spot-welded, rimmed or bonded retention; mark the inlet face and record total stack thickness together with the rim or weld envelope.

From layer specification to an installable stack

Each control connects an individual layer specification with the finished assembly that enters the changer.

Control point	Define before manufacture	Purpose at installation	Verification
Layer schedule	Position, weave, mesh count, wire and alloy	Keeps separation, protection and support in the specified order	Layer identity and inlet-to-outlet order
Backing contact	Plate openings, support weave and flow orientation	Transfers load across the breaker-plate holes	Backing alignment and clear passage
Perimeter retention	Rim width or weld layout; edge envelope	Holds the stack inside the seating land	Layer capture, profile and local thickness
Installed pack	Pocket outline, centre cutouts and closed height	Seats the complete assembly in the changer	Finished thickness, registration and inlet face

Construction

How the pack is layered and joined

Filtering layerThe selected fine layer forms the geometric separation barrier. Its supporting layers carry the pressure load as contamination builds up.
Backing layerA coarse backing screen bridges the breaker-plate openings and supports the fine cloth across the plate-hole span.
Pack handlingSpot welds retain the layer order; rims contain the perimeter. The control layer, its aperture and the stated test method define the filtration rating.
Sequence and identificationIdentify the inlet face and record every layer in order. Keep the pack code with its weave, wire diameter and alloy so replacement orders reproduce the complete stack.

Read the layer schedule in the direction of melt flow

Write the stack from the incoming melt to the breaker plate. Give each layer a position, mesh count, wire diameter, weave and alloy; identify which layer controls separation and which layers protect, drain or support it. In a 20/40/20 or 40/80/200/80/40 schedule, the repeated mesh counts describe the sequence. Wire diameter and weave complete the aperture definition. A layer list that includes these details lets purchasing, production and maintenance identify the same construction.

The downstream backing transfers load from the filtering layer to the breaker plate. Compare its wire arrangement with the plate-hole pattern and the free span between contacts. Keep the filtering face, backing and plate orientation together on the section drawing, including any upstream protection. The geometric open area of a single cloth and the available passage through the assembled pack describe different parts of the flow path; use the actual layer arrangement when comparing melt-pressure trends.

Fit the complete pack to the screen changer

The changer pocket determines the finished outline and seating land. Include the centre hole or kidney-shaped cutouts, locating features, permitted edge envelope and closed assembly height. A rim occupies width and adds edge thickness; spot welds introduce local joining points. Define those features against the clamping land so the pack seats fully and the working mesh covers the flow window. The combined thickness of the loose layers and the finished retained edge are recorded as separate dimensions.

For a screen change, match the pack identifier and inlet face to the specified layer list before installation. Keep the layers registered while transferring the pack to its seat and check that the rim or welds lie in their intended recess. Record clean-start and changeover differential pressure with melt temperature and throughput, making production runs comparable. Continuous reverse-Dutch-weave filter belts follow a continuous-feed interface; discrete screen packs use an individually seated assembly and their own change sequence.

Screen packs

Applications

Screen packs sit immediately upstream of the breaker plate wherever molten polymer has to be cleaned before it reaches the die.

Film extrusion

Retain contamination that causes film defects while controlling melt pressure.

Recycling and compounding

Use pressure trends to distinguish loading from a change in melt viscosity.

Pelletizing

Match the changer cavity and stack support to stable melt delivery.