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Custom Extruders

Custom single-screw extruder design and manufacturing, since 1891

The Bonnot Company designs and builds custom single-screw extruders for applications where standard commercial equipment falls short.

Since 1891, we’ve engineered specialty extrusion equipment across food, chemical, catalyst, carbon, and industrial materials. We start from a proven base design, then run trials in our test facility to refine and optimize the configuration for your material and throughput. Custom Bonnot extruders can be specified across a range of sizes, screw geometries, length-to-diameter (L/D) ratios, horsepower, and RPM ranges, with controls matched to your process.

What Is a Custom Extruder?

A custom extruder is an extrusion machine engineered for a specific material, throughput, and process rather than sold as a fixed standard model. Bonnot builds custom single-screw extruders by adapting screw geometry, length-to-diameter ratio, feed section, drive, and die to the exact requirements of your application. This lets processors run materials or output rates that off-the-shelf extruders cannot handle reliably.

Materials & Industries We Serve

Bonnot custom single-screw extruders process a wide range of materials, including food and pet food, chemicals, catalysts, activated carbon, rubber, clay and ceramics, bulk molding compound, hydrocolloids, sealants, and rodenticides. We serve food processing, specialty chemical, catalyst and carbon production, rubber, and industrial manufacturing. Because each machine is engineered to the material, Bonnot routinely handles abrasive, high-viscosity, and heat-sensitive formulations that standard extruders cannot run reliably.

The Bonnot Test Facility: Prove It Before You Buy

Every Bonnot custom extruder starts in our test facility. We run your actual material on Bonnot equipment to validate screw design, throughput, and product quality before your machine is built — so the final specification comes from measured results, not assumptions. Because throughput depends on material, die, and configuration, empirical testing is how we confirm your machine will hit its target output.

Custom Extruder Specifications

Screw diameter 1″ (25 mm) lab → 24″ (610 mm) large-scale production
L/D ratio ≈2:1 (short, high-pressure packer builds) → 20:1 (long cold-forming / cooking barrels)
Horsepower 0.5 HP (1 Series lab) → 125 HP (10 Series); most production units 10–75 HP
Motor / RPM Motors ~1,780 rpm (or 2-speed 3000/600) through ~37:1–47:1 reducers; auger runs in the low tens of rpm, from ~5 rpm at the low setting
Throughput Not fixed — determined by material, die, and configuration; established empirically at startup

Extruder Design Features

+ Custom feed sections to accommodate your batch size

+ Packer, Screw Geometry & Die Shape

+ Custom contact component material selection to resist wear and corrosion

+ Temperature Control Manifold

+ Designs suitable for higher torque loads and to match the exact throughput you need

+ Custom bases to match centerline height with takeoff equipment or to add casters for mobility to fit your plant layout

+ Custom designs for cleanability to aid with faster material changeovers

+ Custom dies to match the desired shape and size of your extrudate

A turnkey custom extrusion system for a medical application, integrating commercial components into a single validated line — an example of Bonnot's customization and systems-integration capability.

This system demonstrates the level of customization and integration of commercial components for a medical application.

Cooking Extruder

A cooking extruder system using both steam and water for precise process temperature control across five separate zones.

Gear Pump Integration

A gear pump integrated into a full bale feeder for highly metered, low-output delivery — one example of how Bonnot integrates commercial components to enhance a base design.

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Relevant Ancillary Equipment

Extruder Cutter

Extruder Controls

Extruder Dies

Frequently Asked Questions

What is a custom extruder?
A custom extruder is a single-screw extrusion machine engineered for a specific material, throughput, and process rather than sold as a fixed standard model. Bonnot has built custom extruders since 1891.
What size extruders does Bonnot build?
Bonnot custom single-screw extruders range from 1-inch (25 mm) laboratory units to 24-inch (610 mm) large-scale production machines.
How much horsepower do Bonnot extruders have?
Bonnot extruders range from 0.5 HP laboratory units to 125 HP production machines, with most production units running between 10 and 75 HP.
Can I test my material before committing to a custom build?
Yes. Bonnot runs trials in its test facility on your actual material, so the final machine is specified from measured throughput and product-quality results.
What materials can Bonnot extruders process?
Bonnot custom extruders process food, pet food, chemicals, catalysts, carbon, rubber, clay, ceramics, hydrocolloids, sealants, and other specialty materials.
How long has Bonnot been building extruders?
The Bonnot Company has designed and manufactured extruders since 1891.