Patent ID: 11866884
Assignee: nan
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC D  A | IPC A  D

Claim 21:
22. A method for manufacturing a substrate including a first layer and a second layer, the method comprising:
providing a first supply of fibers;
providing a supply of particulates;
providing a headbox, the headbox comprising:
a machine direction;
a cross-direction;
a z-direction, the z-direction being perpendicular to a plane defined by the machine direction and the cross-direction; and
a divider comprising a first surface, a second surface opposite the first surface, a width extending in the cross-direction, and a length extending in the machine direction, the divider separating a first z-directional layer of the headbox from a second z-directional layer of the headbox;

setting a z-directional position of the divider in the headbox to provide a target relative thickness setting of the second z-directional layer of the headbox;
transferring the first supply of fibers and the supply of particulates to the headbox such that the first supply of fibers enter the first z-directional layer of the headbox and the supply of particulates enter the second z-directional layer of the headbox; and
controlling the first supply of fibers and the supply of particulates through the headbox to a forming surface such that a relative thickness of the second layer of the substrate is provided with less than 20% variation of the target relative thickness setting of the second z-directional layer of the headbox.