Designed and manufactured in Quebec since 1986
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Continuous melt filtration

Continuous rotary melt filtration systems

Patt rotary systems introduce clean filtration media continuously while adaptive control holds the selected differential-pressure condition.

Compare the systems Discuss your process Size your filter
Patt C-size fixed disc with machined melt-flow openings
3System families
10–7,000 cm²Configured active-area range
450 °CHigh-temperature option
24/7Continuous-production objective

Continuous filtration keeps production moving

Continuous melt filtration removes contaminants while the extrusion line keeps running. Fresh media or clean filter elements become available without a full production stop, reducing interruptions, restart scrap and repeated thermal changes in the polymer. The result is more usable production time and a steadier melt supply to the downstream process. The filter is selected around particle size, contaminant loading, melt viscosity and the pressure drop the line can accept.

Rotary filtration refines the continuous process

Rotary filtration brings clean screen area into the melt path progressively, matching media renewal to the contamination entering the filter. Controlled advancement limits the pressure disturbance of each change, keeps more of the filtration area working effectively and avoids replacing an entire screen simply because one region has loaded. Patt combines this mechanism with purpose-designed flow passages, heating and materials to manage pressure stability, residence time, wear and corrosion. Rotary III, Rotary IV and Colossus apply these priorities to different line sizes, environments and filtration-area requirements.

Choose by process duty

One control philosophy, three system architectures.

System selection is based on contaminant load, filtration fineness, throughput, polymer stability, cleaning practice and available line space.

Rotary III side profile
Side profile
III

Rotary III

The proven general-purpose platform, available across seven frame sizes and a broad operating envelope.

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Rotary IV side profile
Side profile
IV

Rotary IV

Monoblock construction for high-temperature, corrosive and abrasive polymer service.

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Colossus side profile
Side profile
C/D

Colossus

Modular candle filtration with very high active area and optional pulsed solvent backwash.

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Proven continuous-filtration platform

Rotary III

Full model details

Seven frame sizes make Rotary III the flexible starting point for recycling, film, sheet and compounding lines. Continuous screen renewal and pressure control support stable extrusion; screen area and flow passages are selected around throughput, melt viscosity and contaminant loading.

Filter dimensions and measurement references
Dimensions
Rotary III brochure specifications · all dimensions in millimetres
ModelScreen areaHeatingMax. pressureWeight
Rotary III A10–48 cm²3,200 W5,800 psi105 kg
Rotary III B38–100 cm²4,800 W6,500 psi160 kg
Rotary III C85–184 cm²9,800 W6,500 psi365 kg
Rotary III D150–385 cm²13,000 W6,500 psi1,000 kg
Rotary III E385–815 cm²18,800 W6,500 psi1,450 kg
Rotary III F650–1,480 cm²26,650 W6,500 psi2,050 kg
Rotary III G1,110–1,990 cm²37,000 W6,000 psi2,845 kg

Monoblock filtration platform

Rotary IV

Full model details

Rotary IV is the monoblock platform for lines where corrosion, abrasive compounds and repeated cleaning drive tooling maintenance. Body alloy and surface treatment are chosen together for the resin and exposure, while continuous screen renewal retains Patt’s pressure-control approach.

Filter dimensions and measurement references
Dimensions
Rotary IV specifications · dimensions in millimetres
ModelScreen areaHeatingMax. pressureWeight
Rotary IV A10–48 cm²3,200 W5,800 psi100 kg
Rotary IV B38–100 cm²4,800 W6,500 psi152 kg
Rotary IV C85–184 cm²9,800 W6,500 psi348 kg
Rotary IV D150–385 cm²13,000 W6,500 psi954 kg

High-area modular filtration

Colossus

Full model details

Colossus provides 1,385–7,000 cm² of active candle-filtration area for fine filtration and heavy contaminant loading. It suits processes where media area, element service life and pressure drop are central sizing constraints, with modular elements and optional pulsed solvent backwash.

Filter dimensions and measurement references
Dimensions
Colossus brochure specifications · all dimensions in millimetres
ModelActive areaHeatingMax. pressureWeight
Colossus C1,385–2,770 cm²28,800 W6,500 psi2,400 kg
Colossus D3,460–7,000 cm²46,900 W6,500 psi4,250 kg

Integrated scope

From flow path to production data.

Patt can supply the filter, custom inlet and outlet adapters, dies, breaker plates, filtration media, melt-pressure sensors and control integration as one engineered package.

  • Adaptive differential-pressure control
  • Networked logging and plant-control integration
  • Hazardous-area and high-temperature configurations
  • Application-specific materials and surface engineering
Front engineering drawing of the Patt Colossus candle filter
Custom-engineered package

Filtration upgrades

Wave-shaped breaker plates

Add 80% more screen area with approximately 15 mm additional width. Patt wave-shaped breaker plates offer a compact retrofit for finer filtration, higher contaminant loads or increased throughput, with H13, Dievar, Patt Tool and Patt Structural options.

Explore the wave-shaped breaker plate upgrade
Patt D-size wave-shaped breaker plates with machined screen-support surfaces and flow openings
Wave-shaped breaker plates

Pressure stability

Precise pressure control for consistent extrusion

Stable filtration pressure helps maintain consistent extrusion output and film thickness. Patt rotary filtration progressively introduces fresh screen area through small, controlled disk movements, limiting pressure buildup and sudden changes during screen renewal.

Illustrative overlay: Patt Rotary III follows a steady pressure profile; a pressure-driven belt has repeated pressure cycles; a conventional slide plate has larger buildup-and-release cycles. Relative differential pressure over production time; no measured scale.
Schematic pressure comparison

In pressure-driven belt or ribbon screen changers, melt pressure must generate enough force to advance the screen against friction and resistance within the assembly. Screen movement therefore depends on operating pressure and the behaviour of the polymer seals. An external mechanical puller provides an independent driving force, but transmits that force through the screen belt. Belt tension, movement increments and control response remain important considerations.

Patt’s rotary mechanism applies the driving force to a rigid disk carrying the screen packs. This allows finely controlled renewal of the filtration area without relying on melt pressure to pull a screen belt through the unit.

With conventional slide-plate operation, contamination accumulates between screen changes, increasing differential pressure. Depending on the extrusion line’s controls and pumping arrangement, this can reduce throughput. Introducing a clean screen then produces a sudden reduction in resistance, creating another disturbance for the line to manage.

The control system is integral to this performance. Accurate pressure measurement, responsive disk movement and application-specific tuning allow the filter to react as contamination changes. Matching the filtration unit with the appropriate Patt control helps protect film uniformity, maintain productive output and reduce material lost during process disturbances.

Complete the filtration system with the right control

No filtration system is complete without a control strategy that makes full use of its mechanical capabilities. Patt Rotary Control uses live melt-pressure signals to coordinate media advancement, maintain the selected differential pressure and respond as the resin, throughput or contaminant loading changes. Heating control, operating limits, alarms and line interlocks support stable operation, while recipes and data logging help operators track screen consumption and repeat a successful process. Matching the control to the filter converts its available area and continuous-change mechanism into useful production performance: more consistent melt delivery, better use of filtration media and fewer avoidable disturbances. It protects the value of the filtration investment throughout the operating cycle.

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Screen packs

The filter and its media work together. Patt supplies exclusively laser-cut screens in a wide variety of meshes, with sintered or spot-welded constructions and flat or wave-shaped profiles. Select the filtration layer, support mesh and screen geometry around the polymer, contaminants and allowable pressure drop.

Explore screen packs and waved screens

Operator, cleaning and repair training

Patt offers training for the people who operate, clean and repair its filtration systems. Operator training covers the filter’s operating sequence, controls, screen renewal and response to changing process conditions. Cleaning training addresses the filter components, media handling and preparation for reassembly. Repair training develops familiarity with inspection points, wear components and the correct assembly sequence.

Training is organized around the installed Patt model, its control configuration and the team’s responsibilities. The aim is consistent operation, effective maintenance and fewer avoidable interruptions. Include the model and serial number when requesting training.

Request filter training

Application questions

How do Rotary III, Rotary IV and Colossus differ?

Rotary III offers continuous rotary screen changing across seven frame sizes. Rotary IV uses a monoblock architecture for demanding high-temperature, abrasive or corrosive polymer service. Colossus uses candle elements to provide a large filtration area. Selection starts with polymer, throughput, pressure, temperature, contamination and filtration target.

Can a Patt system be configured for ±1 bar pressure stability?

Yes. Patt offers configurations targeting ±1 bar pressure stability, particularly for thin-film applications. The control system, pressure measurement, filter sizing and line conditions must be specified together for that duty.

Related products and technical guidance

Bring us the process problem, not just a part number.

Share the polymer, throughput, temperature, pressure, contamination and target filtration. Our team will define the right system or process route.

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