RXT65 Corrosion Resistant Conveying Screw Element For PET Food Extrusion

RXT65 Corrosion Resistant Conveying Screw Element for PET Food Extrusion

Rxt65 Corrosion Resistant Conveying Screw Elements for Puffed PET Food Extrusion

In food extrusion, the failure mechanism is not abrasion — it is corrosion.

A puffed PET food line runs warm, moist, mildly acidic material through the extruder for a full production shift, and is then washed down with caustic and acidic cleaning agents before the next one starts. Standard nitrided screw elements, the default choice for industrial compounding, meet that environment badly. The nitrided layer is thin, it is not a true corrosion barrier, and once repeated cleaning exposure has breached it, the underlying steel corrodes and pits.

The result is not a dramatic breakdown. It is a surface that gradually roughens, holds product residue, becomes progressively harder to clean, and eventually fails a hygiene inspection.

That is why conveying elements for puffed food duty are specified on corrosion resistance and surface finish first, and on hardness second.

Material Selection for Corrosive Food Duty

This product is supplied in 316L stainless steel as standard. The full range of corrosion-application materials we manufacture is listed below, so you can specify the grade that matches your formulation and cleaning regime.

Screw Element Details

Conveying Element Types We Manufacture

Special length available: up to 4 times the diameter, for conveying duty.

Heat Treatment by Ourselves

Heat treatment is one of the most important steps in screw production. We have purchased professional heat treatment equipment so that the process is controlled in-house rather than outsourced — which is what allows the quality of the finished element to be fully guaranteed.

Packing Details

Available according to your order quantity and product size — wooden boxes or cartons:

1. Rust-proof oil processing
2. Oiled paper packages
3. Bubble wrap package
4. Special foam packaging
5. Packing
6. Sealing

Why Choose Us

1. Total solution to highly wear-resistant and corrosion-resistant problems
2. Expert in engineering design and consulting
3. Advanced manufacturing capabilities and technology
4. Lean production management
5. Top quality products with high cost performance

Ordering Information

To quote accurately, please provide: machine brand and model (e.g. Rxt65), screw diameter, element type and length, OEM part number if available, processed food formulation and its approximate acidity, chloride or salt content, cleaning regime (CIP chemicals used), and quantity. If you only have the worn or corroded part, we can reverse-engineer from a sample or a dimensional drawing.

Applications

• Puffed and expanded food extrusion — direct-expansion snacks, puffed cereals, expanded starch products
• Cereal and grain-based products — breakfast cereal, extruded flakes, grain-based snacks
• Starch and flour processing — modified starch, pregelatinised flour, starch-based pellets
• Pet food and aquafeed — wet and dry extruded pet food where corrosion resistance is required
• Plant protein and meat analogue extrusion — high-moisture extrusion where moisture drives corrosion
• Confectionery and filled snacks — co-extruded and filled products
• Lines with aggressive CIP regimes — where caustic and acidic cleaning agents determine element life
• High-hygiene applications — where surface finish and cleanability are audited requirements
• Plastic and rubber extrusion — conveying duty on general extruders, using the corresponding material grade
• Pilot and laboratory food extruders — small-diameter lines where corrosion and cleanliness matter most