How does the flight depth and pitch of the screw barrel impact the extrusion process?-Zhoushan Intai Screw Manufacture Co.,Ltd.

How does the flight depth and pitch of the screw barrel impact the extrusion process?

Posted by Admin | 08 Sep

The flight depth and pitch of the screw barrel in the extrusion process play a significant role in determining the quality and characteristics of the extruded product.

1. Flight Depth: The flight depth refers to the distance between the root of the flight and the core diameter of the screw. A shallow flight depth results in a smaller volume of molten material being transported along the screw, while a deeper flight allows for more material to be transported.
- Impact on Output: A shallow flight depth may decrease the output rate since less material is being transported, while a deeper flight depth can increase the output rate due to the larger volume of material being conveyed.
- Impact on Mixing: A deeper flight depth can enhance the mixing efficiency, as it provides more opportunities for the molten material to mix and blend during the screw revolution. This helps to achieve a homogeneous melt and uniform properties throughout the extruded product.

2. Pitch: The pitch is the distance between the same point on consecutive flights of the screw. It determines the rate at which the material is conveyed along the screw barrel.
- Impact on Output: A larger pitch will result in higher output rates, as it allows for more material to be conveyed per revolution. Conversely, a smaller pitch will lower the output rate due to the reduced volume of material conveyed.
- Impact on Melting: A longer pitch can provide more time for heating and melting of the material, which can be advantageous for processing heat-sensitive polymers or materials with higher melting points.

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