The function of the crescent tissue machine headbox is mainly to ensure the uniform distribution and stable flow of pulp onto the forming wire.

Specifically, it serves several key purposes:

1. Pulp Distribution: It evenly distributes the pulp across the width of the machine, ensuring consistent paper formation.
2. Flow Control: It controls the velocity and direction of the pulp flow as it approaches the forming section, which is crucial for creating the desired sheet properties.
3. Stock Dilution: In some designs, the headbox may also help in diluting the stock to achieve the right consistency for optimal sheet formation.

These functions are essential for producing high – quality tissue paper with uniform thickness, strength, and other desired characteristics.