Pressing Cage (Barrel) for Screw Press | Component Specifications

Product Specifications

Technical details and manufacturing context for Pressing Cage (Barrel)

Definition

The pressing cage, also known as the barrel, is the main cylindrical housing component of a continuous screw press used for oil extraction. It encloses the rotating screw shaft and provides the structural framework where oil-bearing materials are compressed under high pressure. The cage contains drainage slots or perforations that allow extracted oil to flow out while retaining the solid press cake. Constructed from high-strength alloy steel or stainless steel, the pressing cage is designed to withstand the high mechanical stresses and abrasive conditions typical of oilseed processing. Key dimensional parameters include an inner diameter ranging from 200 to 600 mm, a length from 800 to 2000 mm, and a wall thickness from 10 to 30 mm. The operating pressure range is 1.0 to 1.6 MPa, with a maximum operating temperature of 80 to 120°C. Material grades commonly specified are 304 or 316L stainless steel, with 316L recommended for corrosive environments. Surface roughness is maintained at Ra 0.8 to 1.6 μm to reduce fouling, and dimensional tolerance on the diameter is ±0.5 mm. The weight of the pressing cage varies from 150 to 800 kg, depending on size and material. Processing capacity ranges from 1 to 10 tons per hour, influenced by oilseed type and moisture content. These values are reference ranges for directory purposes and must be verified against the specific model and application with the legal manufacturer or supplier. The pressing cage is a critical component that directly affects extraction efficiency, product quality, and operational reliability. Proper selection and maintenance are essential to ensure optimal performance and longevity.

Working Principle

The pressing cage provides a confined cylindrical space where materials are progressively compressed by the rotating screw. As the screw conveys material forward, pressure builds up within the cage, forcing oil through the drainage openings in the cage walls while the solid residue continues forward for discharge. The cage's internal geometry and surface finish influence material flow and pressure distribution, affecting oil yield and cake quality. The operating pressure and temperature must be maintained within the specified ranges to ensure effective separation and to prevent damage to the cage or seals. Regular inspection for wear, blockages, or deformation is necessary to maintain performance and avoid premature failure.

Common Materials

High-strength alloy steel, Stainless steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Inner Diameter	200–600 mm	Determines processing capacity
Length	800–2000 mm	Affects residence time and throughput
Wall Thickness	10–30 mm	Ensures structural integrity under pressure
Operating Temperature	80–120 °C	Exceeding 120°C may degrade seals
Material Grade	304/316L	316L for corrosive environmentsASTM A240
Surface Roughness	Ra 0.8–1.6 μm	Smooth finish reduces foulingISO 4287
Tolerance (Diameter)	±0.5 mm	Ensures proper fit with screwISO 2768-m
Weight	150–800 kg	Affects handling and installation
Capacity	1–10 t/h	Depends on oilseed type and moisture

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Cage Body Part
Main cylindrical structure providing containment for pressing operation

Material: High-strength alloy steel
Drainage Bars/Slots Part
Allow oil to escape while retaining solid material

Material: Stainless steel
End Flanges Part
Provide connection points to press frame and discharge mechanism

Material: Carbon steel
Wear Liners Part
Protect inner surface from abrasion by materials

Material: Hardened steel or ceramic

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Pressing Cage (Barrel).

Manufacturers of Pressing Cage (Barrel)

Manufacturer profiles associated with Pressing Cage (Barrel).

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 6 September 2026

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A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

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Frequently Asked Questions

What is the function of the pressing cage in a screw press?

The pressing cage is the cylindrical housing that encloses the screw and provides the confined space where oil-bearing materials are compressed. It has drainage slots that allow oil to escape while retaining the solid cake.

What materials are commonly used for pressing cages?

Common materials include high-strength alloy steel and stainless steel grades such as 304 and 316L. The choice depends on the application and corrosion requirements.

What are the typical dimensional ranges for a pressing cage?

Typical ranges are: inner diameter 200–600 mm, length 800–2000 mm, and wall thickness 10–30 mm. These are reference values and must be confirmed for the specific model.

How should I verify the specifications of a pressing cage?

Always consult the legal manufacturer or supplier for model-specific values, as the directory provides only reference ranges. Verify parameters such as operating pressure, temperature, and material grade against your application requirements.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 100 bar (maximum internal pressure)
other spec:	Slurry concentration: 15-40% solids by weight, Flow rate: 5-50 m³/hr (depends on barrel diameter)
temperature:	50-150°C (typical oil extraction range)

Pressing Cage (Barrel)

Product Specifications

Industry Taxonomies & Aliases

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards