Food Extruder Parts and Food-Grade Twin-Screw Extruder Components

EXTRUTEX manufactures replacement screw elements, kneading blocks, screw shafts, barrel sections and wear components for food and feed twin-screw extruders. We have manufactured replacement parts for machines from Bühler, Baker Perkins, Clextral, Wenger and ANDRITZ, and can assess spare-part requirements for most other food and feed extrusion machine brands against original drawings, technical specifications or physical samples.

Food extrusion requires a different approach from conventional plastics compounding. Moisture content, cooking intensity, product texture, temperature, residence time and cleaning requirements all influence the design of the screw assembly. A replacement component must not only fit the machine; it must also be appropriate for the product, process conditions and hygiene requirements.

EXTRUTEX manufactures parts to customer drawings or dimensions established from original components. Depending on the machine and application, we can work with stainless steels, specified corrosion-resistant materials, wear-resistant alloys and suitable surface treatments. Screw diameters from 7 to 486 mm can be assessed, subject to the required machine geometry and manufacturing specification.

Food and Feed Extruder Brands We Can Support

EXTRUTEX has manufactured replacement components for food and feed extrusion equipment from several established international machine manufacturers. We can also assess parts for other brands, including older machines, regional manufacturers and equipment where original spare parts are difficult to obtain.

Part numbering, screw geometry and shaft connections vary between manufacturers and machine generations. For this reason, we confirm the dimensions and component arrangement before machining. The following directory includes established food and feed extrusion manufacturers and additional machine brands that can be considered for model-specific enquiries.

International food and feed extrusion manufacturers

Additional Chinese and Asian food and feed extruder manufacturers

This is a non-exhaustive manufacturer directory. Some companies listed manufacture single-screw extruders, complete food-processing lines or specialist laboratory machines rather than the same type of co-rotating twin-screw extruder. EXTRUTEX evaluates the exact machine and component before confirming manufacturing feasibility.

Food Extruder Spare Parts We Manufacture

1. Food-grade screw elements

We manufacture single-flight and double-flight conveying elements and other modular screw components for food and feed extrusion equipment. Each element is produced to the specified outside diameter, internal connection, pitch, flight profile and axial length.

• Single-flight conveying elements.
• Double-flight conveying elements.
• Long-pitch and short-pitch conveying elements.
• Mixing and distributive mixing elements.
• Reverse conveying elements where specified.
• Special-purpose screw elements for food and feed processing.

Product-contact surfaces require suitable material selection and finishing. The required surface finish, corrosion resistance and cleanability should be defined according to the machine design and the food-processing application.

2. Kneading blocks

Kneading blocks are assembled from discs with defined thicknesses and stagger angles. In food extrusion, their role is to support the required cooking, hydration, mixing and texturisation process. The correct arrangement depends on the recipe and the target product properties.

• 30-degree stagger kneading blocks.
• 45-degree stagger kneading blocks.
• 60-degree stagger kneading blocks.
• 90-degree stagger kneading blocks.
• Pinned and specialised mixing blocks where required.
• Custom disc thicknesses and element arrangements.

The stagger angle alone does not determine the cooking result. Disc thickness, element sequence, screw speed, moisture, temperature and throughput all influence the process. Replacement blocks should follow the original screw configuration or an approved process design.

3. Screw shafts

EXTRUTEX manufactures replacement screw shafts for modular twin-screw assemblies. Shaft dimensions and coupling geometry must match the existing gearbox and screw-element arrangement.

• Splined screw shafts.
• Keyed screw shafts.
• Custom drive and coupling ends.
• Single and paired shaft assemblies.
• Replacement shafts manufactured to OEM drawings or approved samples.

Depending on the design and location, shaft materials may include 40CrNiMo, H13 or WR15E. These are engineering material options, not automatic food-contact material approvals. Where a shaft or component can contact the product, the material and surface condition must be separately confirmed as suitable for the intended application.

4. Barrels and barrel liners

We manufacture and assess replacement barrel sections and liners for food and feed twin-screw extruders. The barrel bore must maintain the correct geometry and working clearance with the screw assembly.

• Figure-8 barrel sections.
• Feed and conveying barrel sections.
• Venting and degassing sections.
• Closed barrel sections.
• Replaceable barrel liners.
• Wear-resistant and corrosion-resistant bore solutions.
• Custom barrel sections manufactured to drawings or samples.

Polished or plated bores, nitrided surfaces, powder-metallurgy liners and other wear-resistant constructions can be assessed according to the product-contact position and application. Any material, plating or coating that contacts food must be suitable for the intended food-contact conditions and supported by the required documentation.

Why Food Extruder Parts Are Different from Plastics Compounding Parts

Food and feed extrusion may use a similar modular screw arrangement to polymer compounding, but the operating conditions and hygiene requirements can be very different. A replacement part must be designed around the actual process rather than selected only because its dimensions appear similar.

Controlled cooking and shear

In plastics compounding, screw elements are often selected to disperse fillers, break down agglomerates and distribute additives. Food extrusion has different objectives. The screw assembly manages hydration, mixing, cooking, starch transformation, protein texturisation and product expansion.

Excessive mechanical energy can damage texture, cause unwanted product degradation or create local overheating. The kneading arrangement must therefore match the required process conditions. Copying a screw stack from a plastics compounding line is not a reliable way to design a food extrusion screw assembly.

Moisture and corrosion resistance

Food and feed extrusion processes can operate with a broad range of moisture levels. The required water content depends on the product, recipe, preconditioning and extrusion technology. Moisture exposure, cleaning chemicals and temperature cycles can create corrosion risks for unsuitable materials.

Some mineral-rich feed formulations, bone meal, mineral premixes and abrasive aquafeed ingredients can also increase wear. Material selection must consider both corrosion and abrasion rather than treating them as the same problem.

Cleanability and hygienic design

Food-contact components must be designed and finished so that they can be cleaned effectively. Gaps, damaged surfaces, crevices and poorly matched component interfaces can retain product residues. This creates cleaning difficulties and potential contamination risks.

Element-to-element fit, surface finish, accessible cleaning areas and the design of the complete screw assembly are important. A surface that looks smooth is not automatically hygienic; the actual finish, geometry and cleaning procedure all matter.

Food-contact material requirements

Materials used in product-contact areas must be suitable for the intended food or feed application. The appropriate grade depends on the food type, moisture, temperature, cleaning chemicals and applicable regulatory requirements.

Wear-resistant coatings and surface treatments must not be assumed suitable for food contact simply because they provide good abrasion resistance. Their suitability, process conditions and supporting documentation must be confirmed before use in a product-contact area.

Materials for Food and Feed Extruder Parts

Material selection depends on the component's location, the product being processed, the cleaning regime and the expected wear mechanism. Product-contact components and non-product-contact mechanical components should be specified separately.

For abrasive recipes, a high-hardness corrosion-resistant material may be considered. A hardness target such as 58–62 HRC is not suitable for every stainless steel grade. It must be linked to a specific hardenable alloy and heat-treatment specification. The final material should be selected only after the application and product-contact requirements have been reviewed.

Food Extruder Applications

EXTRUTEX can assess replacement components for a broad range of food and feed extrusion applications.

• Breakfast cereals: conveying elements, kneading blocks and barrel components for cereal processing.
• Expanded snacks: screw components for controlled cooking, expansion and product shaping.
• Pet food: screw elements, shafts and barrel parts for dry pet food production.
• Aquafeed: replacement parts for fish feed and other aquatic feed processing.
• Textured vegetable protein: components for plant-protein extrusion and texturisation.
• Food ingredients: screw and barrel parts for starch, protein and ingredient processing.
• Confectionery: selected extrusion equipment and specialist food-processing applications.
• Pasta and cereal products: model-specific screw components and wear parts.
• Feed premixes: components for mineral-rich and abrasive feed formulations.
• Specialty food products: custom components for specific recipes and extrusion conditions.

Replacement Parts for Bühler Food Extruders

Bühler manufactures twin-screw extrusion platforms for breakfast cereals, food ingredients, pet food and aquafeed. Its product range includes PolyTwin, EcoTwin, CompacTwin and Nutrex platforms, in addition to other equipment generations.

EXTRUTEX can assess replacement screw elements, kneading blocks, screw shafts and barrel sections for specified Bühler machines. The exact model, screw diameter, shaft connection and component position are required to confirm compatibility.

Replacement Parts for Baker Perkins Extruders

Baker Perkins is an established name in food extrusion, including cereal, snack and confectionery processing. EXTRUTEX can assess replacement components for MPF and SBX machine platforms.

• Conveying screw elements.
• Kneading and mixing blocks.
• Replacement screw shafts.
• Barrel sections and liners.
• Single components and matched screw assemblies.

For Baker Perkins replacement parts, provide the machine model, element position and original part number if available. If the original drawing is no longer available, a physical sample may be used for dimensional assessment.

Replacement Parts for Clextral Food Extruders

Clextral is known for co-rotating twin-screw extrusion systems used in food, feed, cereal and plant-protein applications. EXTRUTEX can assess replacement screw elements, kneading blocks, shafts and barrel sections for specified BC and EVOLUM machines.

Because screw configurations can vary by machine generation and process, the complete element arrangement should be considered when manufacturing replacement parts.

Replacement Parts for Wenger Food and Feed Extruders

Wenger manufactures extrusion equipment for pet food, aquatic feed, snacks and other food-processing applications. EXTRUTEX can assess replacement screw elements, kneading blocks and wear components for confirmed TX, Magnum and other machine configurations.

Send the machine model and screw arrangement so that the required geometry, material and manufacturing tolerances can be reviewed.

Replacement Parts for ANDRITZ Food and Feed Extruders

ANDRITZ supplies equipment for feed, aquafeed and food processing. EXTRUTEX can review replacement-part requirements for specified ANDRITZ extruder models, including screw elements, barrel components, shafts and liners.

For older machines or discontinued configurations, a drawing or physical sample can help establish the original dimensions.

Replacement Parts for Other Food Extruder Brands

EXTRUTEX can also assess spare-part requirements for other food and feed extrusion manufacturers. These include Coperion, GEA, Extru-Tech, American Extrusion International, The Bonnot Company, Diamond America, CPM, Amandus Kahl, FAMSUN, IDAH, Brabender, Schaaf Technologie, Pavan and other regional machine builders.

Some manufacturers produce single-screw food extruders, specialist processing equipment or laboratory machines rather than modular co-rotating twin-screw extruders. We therefore confirm the machine architecture and actual component requirements before accepting an order.

How We Manufacture Replacement Food Extruder Parts

EXTRUTEX can work from OEM drawings, approved technical specifications, part numbers or physical samples. The manufacturing process begins with technical identification and dimensional confirmation.

1. Machine identification: We record the manufacturer, model, machine generation and screw diameter.
2. Component identification: We establish the position of the element, shaft or barrel section within the machine.
3. Dimensional inspection: Critical dimensions, connection geometry and relevant tolerances are checked.
4. Material confirmation: The product-contact and non-product-contact material requirements are reviewed separately.
5. Machining: The component is manufactured according to the confirmed drawing or approved dimensional specification.
6. Finishing: Surface finish, treatment and cleaning requirements are applied according to the component's intended duty.
7. Inspection: Critical dimensions are checked against the agreed specification before shipment.

Dimensional Inspection and Quality Control

Correct fit is essential for replacement screw elements and barrel components. EXTRUTEX can provide dimensional inspection according to the agreed drawing and quality requirements.

• Outside diameter and element length inspection.
• Flight pitch and relevant screw-profile measurements.
• Internal spline, keyway or shaft connection inspection.
• Kneading disc thickness and stagger-angle verification.
• Barrel bore and centre-distance inspection where specified.
• Surface finish checks according to the agreed requirement.
• Material and heat-treatment documentation as specified in the order.
• CMM dimensional report for the agreed critical features.

Inspection reports can be supplied with the production batch. Material certificates and other documents should be specified at the quotation stage so that traceability and documentation requirements can be confirmed.

Reverse Engineering When the OEM Drawing Is Missing

Many food and feed extruders have been in service for years. Original drawings may be unavailable, part numbers may have changed, and some OEM spare parts may have long delivery times. EXTRUTEX can assess worn original components and reproduce replacement parts when enough information is available.

For screw elements, we normally inspect:

• Outside diameter and overall length.
• Internal spline or shaft connection.
• Flight lead, pitch and profile geometry.
• Element orientation and position on the shaft.
• Disc thickness and stagger angle for kneading blocks.
• Wear patterns and remaining measurable surfaces.

For barrel sections, we may require the bore diameter, centre distance, section length, connection dimensions and bolt pattern. If the original component is severely worn, an unworn neighbouring element or the shaft and barrel drawings may be needed to establish the correct original dimensions.

What Information to Send for a Quotation

To help us identify the correct replacement component, please provide as much of the following information as possible.

Lead Time and Supply Options

Delivery time depends on the machine brand, material availability, component complexity and whether the original drawings are available.

For planned maintenance shutdowns, we recommend sending the drawings and part information early. Special material grades, surface finishes and inspection documentation can affect the manufacturing schedule. Transit time is additional to the manufacturing lead time.

Frequently Asked Questions

Contact EXTRUTEX for Food Extruder Spare Parts