Extrudate Cutting Mechanism for Melt Flow Index Testers

Product Specifications

Technical details and manufacturing context for Extrudate Cutting Mechanism

Definition

The extrudate cutting mechanism is a critical component of the Polymer Melt Flow Index Tester, responsible for cleanly and precisely cutting the molten polymer extrudate at specified time intervals (typically 10-second marks) to obtain uniform samples for mass measurement, which is essential for calculating the melt flow rate (MFR) or melt volume rate (MVR) of thermoplastics. This component is designed for integration into benchtop testing equipment used in quality control and material characterization. The mechanism is typically actuated by a solenoid, pneumatic cylinder, or motor-driven cam, and it positions a sharp blade (rotary or guillotine-style) across the path of the extrudate. Upon receiving a timed signal from the tester's control system, it rapidly moves the blade to shear the polymer strand cleanly without deformation, then retracts to allow uninterrupted extrusion until the next cut cycle. The cutting force is specified in the range of 50–200 N, sufficient for polymer strands up to 10 mm diameter. Cutting speed is adjustable from 10 to 60 cuts per minute to match extrusion rate. Cutting accuracy is repeatable within ±0.1 mm. The mechanism accommodates strand diameters from 1 to 10 mm for standard MFI testing. Operating temperature range is 0–50 °C. For pneumatic actuation, operating pressure is 0.4–0.6 MPa. Supply voltage is 24 V DC ±10% for solenoid valve and sensors. Power consumption is ≤50 W including solenoid and control. Protection rating is IP54–IP65 per IEC 60529. Blade material is stainless steel 9Cr18MoV (HRC 55–60) per GB/T 1220. Body material is corrosion-resistant stainless steel 304 per ASTM A240. Net weight is 5–8 kg. Approximate dimensions are 200×150×120 mm (L×W×H), varying with model. These values are directory reference ranges; verify model-specific specifications with the legal manufacturer or supplier.

Working Principle

The mechanism is typically actuated by a solenoid, pneumatic cylinder, or motor-driven cam. It positions a sharp blade (rotary or guillotine-style) across the path of the extrudate. Upon receiving a timed signal from the tester's control system, it rapidly moves the blade to shear the polymer strand cleanly without deformation, then retracts to allow uninterrupted extrusion until the next cut cycle.

Common Materials

Tool steel, Stainless steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Cutting Force	50–200 N	Sufficient for polymer strands up to 10 mm diameter
Cutting Speed	10–60 cuts/min	Adjustable to match extrusion rate
Cutting Accuracy	±0.1 mm	Repeatable strand length within tolerance
Strand Diameter Range	1–10 mm	For standard MFI testing
Operating Temperature	0–50 °C	Ambient conditions for mechanism
Operating Pressure	0.4–0.6 MPa	Pneumatic actuation pressure
Supply Voltage	24 ±10% V DC	For solenoid valve and sensors
Power Consumption	≤50 W	Includes solenoid and control
Protection Rating	IP54–IP65	Dust and splash protectionIEC 60529
Blade Material	9Cr18MoV	Stainless steel, HRC 55–60GB/T 1220
Body Material	304	Corrosion-resistant stainless steelASTM A240
Net Weight	5–8 kg	Compact for benchtop integration
Dimensions (L×W×H)	200×150×120 mm	Approximate, varies with model

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

Cutting blade Part
Shears the molten polymer extrudate with a clean edge.

Material: Hardened tool steel or carbide
Actuator (solenoid/pneumatic cylinder)
Provides the mechanical force to drive the blade through the extrudate.

Material: Steel, aluminum
Blade guide/alignment block Part
Ensures precise linear motion and alignment of the blade for repeatable cuts.

Material: Stainless steel

Manufacturers of Extrudate Cutting Mechanism

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Frequently Asked Questions

What is the typical cutting force range?

The cutting force is specified as 50–200 N, sufficient for polymer strands up to 10 mm diameter. Verify the exact force for your specific model and application with the manufacturer.

Can the cutting speed be adjusted?

Yes, the cutting speed is adjustable from 10 to 60 cuts per minute to match the extrusion rate. The appropriate setting depends on the material and test conditions.

What materials are used for the blade and body?

The blade is made of stainless steel 9Cr18MoV (HRC 55–60) per GB/T 1220, and the body is stainless steel 304 per ASTM A240. These materials provide corrosion resistance and durability.

What is the operating temperature range?

The mechanism is designed for ambient conditions of 0–50 °C. Ensure the environment stays within this range for reliable operation.

Data Basis

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pressure:	Atmospheric to 5 bar (non-pressurized cutting environment)
flow rate:	0.1 to 50 g/10 min (MFI test range)
temperature:	Ambient to 250°C (typical polymer processing range)
strand diameter:	2 to 10 mm (standard extrudate dimensions)

Extrudate Cutting Mechanism

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