How much clearance do you need between screw and barrel?

Apr 07,2024

The clearance between the screw and barrel in a screw extruder, which is commonly used in plastic processing, is typically very small to ensure efficient material conveyance and melting. The clearance is usually kept to a minimum to prevent leakage of molten material back along the screw flights.

In general, the clearance between the screw and barrel is in the range of 0.1% to 0.3% of the screw diameter. For example, if the screw diameter is 50 mm, the clearance would typically be between 0.05 mm to 0.15 mm. However, these values can vary depending on the specific material being processed, the design of the extruder, and the desired output characteristics.

Maintaining a consistent and appropriate clearance is essential for achieving proper melt quality, throughput, and energy efficiency in the extrusion process.

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