Cutting Rotor for Polymer Pelletizing | Specifications & Verification

Product Specifications

Technical details and manufacturing context for Cutting Rotor

Definition

The Cutting Rotor is a critical rotating component within a Polymer Pelletizing Strand Cutter. It consists of multiple blades mounted on a central shaft, designed to cut continuous polymer strands into uniform pellets. As the strands are fed into the cutter, the rotor spins at high speed, and the blades make precise shearing cuts against stationary bed knives or counter-blades. The rotor's design, blade configuration, and rotational speed directly determine pellet size, shape consistency, and production efficiency. This component is used in rubber and plastic product manufacturing, specifically in pelletizing systems for thermoplastics and other polymer materials. The rotor is available in various configurations to match different extruder widths and production capacities. Key parameters include rotor diameter (150–300 mm), rotor length (300–1000 mm), number of blades (3–12), blade material (e.g., 9Cr18MoV per GB/T 1299), rotor speed (500–3000 rpm), cutting tolerance (±0.05 mm), operating temperature (20–120°C), maximum operating pressure (1.0–1.6 MPa), IP rating (IP54–IP65), and weight (50–200 kg). These values are reference ranges and must be confirmed for the specific model and application. The rotor is typically made from tool steel, stainless steel, or hardened alloy steel, offering high wear resistance for abrasive polymers. Proper selection requires consideration of polymer type, throughput requirements, and desired pellet dimensions. Verification of model-specific values and standards with the legal manufacturer or supplier is essential before procurement.

Working Principle

The rotor rotates at controlled speeds driven by a motor. Polymer strands are fed tangentially or axially into the cutting chamber where the rotating blades make clean, shearing cuts against stationary bed knives or counter-blades. The centrifugal force helps eject cut pellets from the chamber. The rotor speed and blade configuration are adjusted to achieve the desired pellet size and production rate. The cutting tolerance ensures uniform pellet dimensions. Operating temperature and pressure must be maintained within specified limits to prevent blade deformation. The IP rating protects the rotor from dust and water jets, ensuring reliable operation in industrial environments.

Common Materials

Tool Steel, Stainless Steel, Hardened Alloy Steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rotor Diameter	150–300 mm	Determines throughput and pellet size range.
Rotor Length	300–1000 mm	Matches extruder width and production capacity.
Number of Blades	3–12 pcs	Affects cut quality and pellet uniformity.
Blade Material	9Cr18MoV	High wear resistance for abrasive polymers.GB/T 1299
Rotor Speed	500–3000 rpm	Higher speeds increase throughput but may cause overheating.
Cutting Tolerance	±0.05 mm	Ensures uniform pellet size.
Operating Temperature	20–120 °C	Above 120°C may cause blade deformation.
IP Rating	IP54–IP65	Protects against dust and water jets.IEC 60529
Weight	50–200 kg	Affects installation and handling.

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

Rotor Shaft Part
Central structural component that transmits torque and supports blades

Material: Alloy Steel
Cutting Blades Part
Sharp edges that perform the actual cutting of polymer strands

Material: Hardened Tool Steel
Blade Mounting Brackets Part
Secure blades to the rotor shaft at precise angles and positions

Material: Steel
Balance Weights Part
Counterweights to ensure smooth rotation at high speeds

Material: Steel

Manufacturers of Cutting Rotor

Manufacturer profiles associated with Cutting Rotor.

Sourcing Cutting Rotor from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Procurement Evaluation Criteria

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.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Frequently Asked Questions

What materials are used for the Cutting Rotor?

The rotor can be made from tool steel, stainless steel, or hardened alloy steel. The blade material may be specified as 9Cr18MoV per GB/T 1299, offering high wear resistance for abrasive polymers. Confirm the exact material for your application with the manufacturer.

How does the rotor speed affect pellet quality?

Rotor speed influences throughput and pellet size. Higher speeds can increase production but may cause overheating. The reference range is 500–3000 rpm. Optimal speed depends on polymer type and desired pellet dimensions; verify with the manufacturer.

What is the cutting tolerance and why is it important?

The cutting tolerance is ±0.05 mm, ensuring uniform pellet size. This precision is critical for consistent product quality. Confirm that the rotor meets this tolerance for your specific application.

What operating conditions must be maintained?

The operating temperature should be between 20–120°C; above 120°C may cause blade deformation. The maximum operating pressure is 1.0–1.6 MPa. The IP rating is IP54–IP65, protecting against dust and water jets. Always verify these parameters with the manufacturer.

Data Basis

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

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Buyer enquiry

Request manufacturing insight for Cutting Rotor

Ask for use case, specification boundaries, supplier type, and RFQ preparation information for this product.

Where it goes: Straight to the CNFX editorial desk, and to the manufacturer if this product is linked to a claimed profile. Nothing is broadcast to a supplier list.
Your details stay here: We do not sell or rent enquiry data, and we do not add you to a mailing list. Used only to answer this request.
No commission, no middleman: CNFX is a directory. We take no cut of any order and never negotiate on a supplier's behalf.
What we don't claim: A listing is not an endorsement. Qualify every supplier and verify every figure yourself before ordering.

pressure:	Atmospheric to 5 bar (cutting chamber)
flow rate:	100-5000 kg/hr (polymer throughput)
temperature:	+20°C to +120°C
slurry concentration:	Up to 70% solids by weight (water-cooled systems)

Cutting Rotor

Product Specifications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards